A directory of where to buy chemicals in the USA, including: distributors, industrial manufacturers, bulk supplies and wholesalers of raw ingredients & finished goods.
Biotin-PEG4-OH is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG4-OH can be used in the synthesis of a series of PROTACs. Synonyms: Biotin-PEG4-alcohol; N-(2-(2-(2-(2-Hydroxyethoxy)ethoxy)ethoxy)ethyl)-5-((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanamide. Grade: 95%. CAS No. 1778736-18-7. Molecular formula: C18H33N3O6S. Mole weight: 419.54.
Biotin-PEG4-PC-PEG4-alkyne
Biotin-PEG4-PC-PEG4-alkyne is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG4-PC-PEG4-alkyne can be used in the synthesis of a series of PROTACs. Molecular formula: C42H66N6O15S. Mole weight: 927.07.
Biotin-PEG4-PFP ester
Biotin-PEG4-PFP ester is a special biotin derivative that has a wide range of uses in protein or peptide labeling. It facilitates precise identification of biotinylated entities and is critical for drug delivery exploration, diagnostic work, and target validation studies. Its infinite versatility makes it a potential tool in the fight against a variety of diseases, including cancer, cardiovascular disease, and infectious diseases. Synonyms: Biotin-PEG4-PFP ester. CAS No. 1334172-58-5. Molecular formula: C27H36F5N3O8S. Mole weight: 657.65.
Biotin-PEG4-Picolyl azide
Biotin-PEG4-Picolyl azide is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG4-Picolyl azide can be used in the synthesis of a series of PROTACs. Synonyms: Biotin picolyl azide. Grade: ≥95%. CAS No. 2222687-71-8. Molecular formula: C27H42N8O7S. Mole weight: 622.74.
Biotin-PEG4-propargyl
Biotin-PEG4-propargyl. Uses: Designed for use in research and industrial production. Product Category: Biotin PEG Linkers. CAS No. 1458576-00-5. Molecular formula: C21H35N3O6S. Mole weight: 457.58. Purity: 95%+. Product ID: ACM1458576005. Alfa Chemistry ISO 9001:2015 Certified.
Biotin-PEG4-propionic acid
(+)-Biotin-PEG4-acid (CAS# 721431-18-1) is a useful research chemical compound. Synonyms: 3-[2-[2-[2-[2-[[5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-1-oxopentyl]amino]ethoxy]ethoxy]ethoxy]ethoxy]propanoic acid; 3-[2-[2-[2-[2-[5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]pentanoylamino]ethoxy]ethoxy]ethoxy]ethoxy]propanoic acid. Grade: >97%. CAS No. 721431-18-1. Molecular formula: C21H37N3O8S. Mole weight: 491.60.
Biotin-PEG4-propionic acid
Biotin-PEG4-propionic acid. Group: Biochemicals. Grades: Highly Purified. CAS No. 721431-18-1. Pack Sizes: 25mg, 50mg, 100mg, 250mg, 500mg. Molecular Formula: C21H37N3O8S. US Biological Life Sciences.
Worldwide
Biotin-PEG4-SS-Alkyne
Biotin-PEG(4)-SS-Alkyne is a click chemistry reagent containing an alkyne group. CAS No. 1260247-54-8. Molecular formula: C29H49N5O8S3. Mole weight: 691.92.
Biotin-PEG(4)-SS-Azide is a click chemistry reagent containing an azide group. CAS No. 1260247-52-6. Molecular formula: C29H52N8O8S3. Mole weight: 736.97.
Biotin-PEG4-STP Ester
Biotin-PEG4-STP Ester (4-Sulfo-2,3,5,6-tetrafluorophenyl ester) is an amine-reactive, water-soluble labeling reagent used to modify proteins, antibodies, and other amine-containing biopolymers in 100% aqueous media. The hydrophilic polyethylene glycol (PEG) spacer arm of this reagent imparts water solubility that is transferred to the labeled molecule, thus reducing aggregation of labeled proteins stored in solution. The PEG spacer arm also gives the reagent a long and flexible connection to minimize steric hindrance involved with binding to avidin molecules. Synonyms: Biotin-PEG4-STP Ester. Molecular formula: C27H37F4N3O11S2. Mole weight: 719.7.
Biotin-PEG4-TFP ester
Biotin-PEG4-TFP ester is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG4-TFP ester can be used in the synthesis of a series of PROTACs. Molecular formula: C27H37F4N3O8S. Mole weight: 639.66.
Biotin-PEG4-thiol
Biotin-PEG4-thiol is a biotin-PEG derivative for biotinylation. The biotin group serves as an affinity label towards the proteins avidin and streptavidin. Grade: >95%. Molecular formula: C18H33N3O5S2. Mole weight: 435.6.
Biotin-PEG4-tris-alkyne
A branched linker with three alkyne moieties for click chemistry and a biotin moiety to bind to streptavidin. Grade: >90% by HPLC. Molecular formula: C34H52N4O10S. Mole weight: 708.87.
Biotin-PEG5-amine is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG5-amine can be used in the synthesis of a series of PROTACs. Synonyms: (+)-Biotin-PEG5-CH2CH2NH2. Grade: >95%. CAS No. 113072-75-6. Molecular formula: C22H42N4O7S. Mole weight: 506.66.
Biotin-PEG5-azide is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG5-azide can be used in the synthesis of a series of PROTACs. Synonyms: (+)-Biotin-PEG5-CH2CH2N3. Grade: >97%. CAS No. 1163732-89-5. Molecular formula: C22H40N6O7S. Mole weight: 532.65.
Biotin-PEG5-azide
Biotin-PEG5-azide. Uses: Designed for use in research and industrial production. Product Category: Biotin PEG Linkers. CAS No. 1309649-57-7. Molecular formula: C20H36N6O6S. Mole weight: 488.6. Purity: 95%+. Product ID: ACM1309649577. Alfa Chemistry ISO 9001:2015 Certified.
Biotin-PEG5-NH-Boc
Biotin-PEG5-NH-Boc is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG5-NH-Boc can be used in the synthesis of a series of PROTACs. CAS No. 189209-28-7. Molecular formula: C27H50N4O9S. Mole weight: 606.77.
Biotin-PEG5-thiol
Biotin-PEG5-thiol is a biotin-PEG derivative for biotinylation. The biotin group serves as an affinity label towards the proteins avidin and streptavidin. Synonyms: Biotin-PEG5-SH. Grade: >95%. Molecular formula: C20H37N3O6S2. Mole weight: 479.21.
Biotin-PEG6-acid
(+)-Biotin-PEG6-acid (CAS# 1352814-10-8 ) is a useful research chemical. Synonyms: 3-[2-[2-[2-[2-[2-[2-[[5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-1-oxopentyl]amino]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]propanoic acid; 3-[2-[2-[2-[2-[2-[2-[5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]pentanoylamino]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]propanoic acid. Grade: >97%. CAS No. 1352814-10-8. Molecular formula: C25H45N3O10S. Mole weight: 579.70.
Biotin-PEG6-alcohol
Biotin-PEG6-alcohol is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG6-alcohol can be used in the synthesis of a series of PROTACs. Synonyms: (+)-Biotin-PEG6-OH; (+)-Biotin-PEG6-alcohol; Biotin-PEG6-OH. Grade: >97%. CAS No. 906099-89-6. Molecular formula: C22H41N3O8S. Mole weight: 507.64.
Biotin-PEG6-amine
Biotin-PEG6-amine is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG6-amine can be used in the synthesis of a series of PROTACs. Synonyms: (+)-Biotin-PEG6-CH2CH2NH2; (+)-Biotin-PEG6-amine; Biotin-PEG6-CH2CH2NH2. Grade: >97%. Molecular formula: C24H46N4O8S. Mole weight: 550.71.
Biotin-PEG6-amine
Biotin-PEG6-amine. Uses: Designed for use in research and industrial production. Product Category: Biotin PEG Linkers. CAS No. 113072-75-6. Molecular formula: C22H42N4O7S. Mole weight: 506.66. Purity: 95%+. Product ID: ACM113072756. Alfa Chemistry ISO 9001:2015 Certified. Categories: Biotin PEG2 amine.
Biotin-PEG6-azide
Biotin-PEG6-azide is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG6-azide can be used in the synthesis of a series of PROTACs. CAS No. 1085938-09-5. Molecular formula: C24H44N6O8S. Mole weight: 576.71.
Biotin-PEG6-Boc
Biotin-PEG6-Boc is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG6-Boc can be used in the synthesis of a series of PROTACs. CAS No. 1352814-07-3. Molecular formula: C29H53N3O10S. Mole weight: 635.81.
Biotin-PEG6-hydrazide
Biotin-PEG6-hydrazide is a biotin-PEG derivative for biotinylation. The biotin group serves as an affinity label towards the proteins avidin and streptavidin. Synonyms: (+)-Biotin-PEG6-hydrazide. Grade: >95%. Molecular formula: C25H47N5SO9. Mole weight: 593.73.
Biotin-PEG6-NH-Boc
Biotin-PEG6-NH-Boc is a Biotin compound with a Boc protected amine moiety. Please contact us for GMP-grade inquiries. Synonyms: Biotin-PEG6-NH-Boc; 1292268-20-2; HY-W190945; BP-23614; CS-0254648; tert-butyl N-[2-[2-[2-[2-[2-[2-[2-[5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]pentanoylamino]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethyl]carbamate. Grade: 0.98. CAS No. 1292268-20-2. Molecular formula: C29H54N4O10S. Mole weight: 650.8.
Biotin-PEG6-NH-Mal
Biotin-PEG6-Mal is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG6-Mal can be used in the synthesis of a series of PROTACs. Synonyms: (+)-Biotin-PEG6-NH-Mal; Biotin-PEG6-Mal; Biotin-PEG6-Maleimide; (+)-Biotin-PEG6-Maleimide. Grade: >97%. CAS No. 1808990-66-0. Molecular formula: C31H51N5O11S. Mole weight: 701.83.
Biotin-PEG6-NHS ester
Biotin-PEG6-NHS ester is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG6-NHS ester can be used in the synthesis of a series of PROTACs. Synonyms: (+)-Biotin-PEG6-NHS Ester. Grade: >97%. CAS No. 2055045-04-8. Molecular formula: C29H48N4O12S. Mole weight: 676.78.
Biotin-PEG6-Thalidomide
Biotin-PEG6-Thalidomide is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG6-Thalidomide can be used in the synthesis of a series of PROTACs. CAS No. 2144775-48-2. Molecular formula: C37H53N5O12S. Mole weight: 791.91.
Biotin-PEG7-amine
Biotin-PEG7-amine is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG7-amine can be used in the synthesis of a series of PROTACs. Synonyms: Biotin-PEG7-NH2. Grade: >95%. CAS No. 1334172-76-7. Molecular formula: C26H50N4O9S. Mole weight: 594.76.
Biotin-PEG7-amine
Biotin-PEG7-amine is a PEG-based PROTAC linker that can be used in the synthesis of PROTACs [1]. Uses: Scientific research. Group: Signaling pathways. CAS No. 1334172-76-7. Pack Sizes: 5 mg; 10 mg; 25 mg; 50 mg; 100 mg. Product ID: HY-140898.
Biotin-PEG7-azide
Biotin-PEG7-azide is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG7-azide can be used in the synthesis of a series of PROTACs. CAS No. 1334172-75-6. Molecular formula: C26H48N6O9S. Mole weight: 620.76.
Biotin-PEG7-C2-NH-Vidarabine-S-CH3
Biotin-PEG7-C2-NH-Vidarabine-S-CH3 is a PEG-based linker that incorporates adenosine analog Vidarabine. Vidarabine is an antiviral agent which is active against herpes simplex and varicella zoster viruses. Synonyms: Biotin-PEG7-C2-NH-Vidarabine-S-CH3|HY-145248|CS-0370383. Grade: >98%. Molecular formula: C37H62N8O12S2. Mole weight: 875.06.
Biotin-PEG7-C2-S-Vidarabine
Biotin-PEG7-C2-S-Vidarabine is a PEG-based linker that incorporates adenosine analog Vidarabine. Vidarabine is an antiviral agent which is active against herpes simplex and varicella zoster viruse. Synonyms: Biotin-PEG7-C2-S-Vidarabine|HY-145247|CS-0370381. Grade: >98%. Molecular formula: C36H60N8O12S2. Mole weight: 861.04.
Biotin-PEG7-thiourea
Biotin-PEG7-thiourea is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG7-thiourea can be used in the synthesis of a series of PROTACs. CAS No. 2353409-59-1. Molecular formula: C27H51N5O9S2. Mole weight: 653.85.
Biotin-PEG8-acid
Biotin-PEG8-acid is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG8-acid can be used in the synthesis of a series of PROTACs. CAS No. 2143964-62-7. Molecular formula: C29H53N3O12S. Mole weight: 667.81.
Biotin-PEG8-alcohol
Biotin-PEG8-alcohol is a biotin-PEG derivative for biotinylation. The biotin group serves as an affinity label towards the proteins avidin and streptavidin. Synonyms: (+)-Biotin-PEG8-OH; (+)-Biotin-PEG8-alcohol; Biotin-PEG8-OH. Grade: >97%. Molecular formula: C26H49N3O10S. Mole weight: 595.75.
Biotin-PEG8-amine is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG8-amine can be used in the synthesis of a series of PROTACs. CAS No. 2183447-27-8. Molecular formula: C28H54N4O10S. Mole weight: 638.81.
Biotin-PEG8-amine
Biotin-PEG8-amine. Uses: Designed for use in research and industrial production. Product Category: Biotin PEG Linkers. CAS No. 1334172-76-7. Molecular formula: C26H50N4O9S. Mole weight: 594.76. Purity: 95%+. Product ID: ACM1334172767. Alfa Chemistry ISO 9001:2015 Certified. Categories: Biotin PEG2 amine.
Biotin-PEG8-azide
Biotin-PEG8-azide is click chemistry reagent for biotinylation of macromolecule Please contact us for GMP-grade inquiries. Synonyms: Biotin-PEG8-azide; SCHEMBL21150837; 2363756-34-5; N-(26-Azido-3,6,9,12,15,18,21,24-octaoxahexacosyl)-5-((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanamide; BP-25110. Grade: 0.98. CAS No. 2363756-34-5. Molecular formula: C28H52N6O10S. Mole weight: 664.8.
Biotin-PEG8-NHS ester is a biotin-PEG derivative for biotinylation. The biotin group serves as an affinity label towards the proteins avidin and streptavidin. Synonyms: (+)-Biotin-PEG8-NHS Ester. Grade: >97%. Molecular formula: C33H56N4SO14. Mole weight: 764.88.
Biotin-PEG8-NHS ester
Biotin-PEG8-NHS ester. Uses: Designed for use in research and industrial production. Product Category: Biotin PEG Linkers. CAS No. 2143968-03-8. Molecular formula: C33H56N4O14S. Mole weight: 764.88. Purity: 95%+. Product ID: ACM2143968038. Alfa Chemistry ISO 9001:2015 Certified.
Biotin-PEG8-propionic acid
Biotin-PEG8-propionic acid is a biotin-PEG derivative for biotinylation. The biotin group serves as an affinity label towards the proteins avidin and streptavidin. Synonyms: (+)-Biotin-PEG8-CH2CH2COOH; (+)-Biotin-PEG8-propionic acid; Biotin-PEG8-CH2CH2COOH. Grade: >97%. Molecular formula: C29H53N3SO12. Mole weight: 667.81.
Biotin-PEG8-Vidarabine is a PEG-based linker that incorporates adenosine analog Vidarabine. Vidarabine is an antiviral agent which is active against herpes simplex and varicella zoster viruses. Synonyms: Biotin-PEG8-Vidarabine|HY-145246|CS-0370379. Grade: >98%. Molecular formula: C36H60N8O13S. Mole weight: 844.97.
Biotin-PEG9-CH2CH2COOH
Biotin-PEG9-CH2CH2COOH is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG9-CH2CH2COOH can be used in the synthesis of a series of PROTACs. Molecular formula: C31H57N3O13S. Mole weight: 711.86.
Biotin-PEG9-NHS Ester
Biotin-PEG9-NHS Ester is a polyethylene glycol (PEG)-based PROTAC linker. Biotin-PEG9-NHS Ester can be used in the synthesis of a series of PROTACs. Molecular formula: C35H60N4O15S. Mole weight: 808.93.
Biotin-PEG-AC, MW 1k-10k
Biotin-PEG-AC is a linear heterobifunctional PEG reagent with two different activated terminal groups. It is used in cell culture, pharmaceutical research, drug delivery and release, nanotechnology and new materials.Biotin terminal group can label specific molecules, structures or tissues. The other terminal group participates in kinds of active reactions. Biotin-PEG-AC can be used as argeted markers for small molecules or materials. Mole weight: Customizable.
Biotin-PEG-azide, MW 1K-10K
Biotin-PEG-azide, MW 1,000 is a biotinylation reagent which has strong binding affinity to avidin or streptavidin. The azide moiety can react with terminal alkyne via copper click reaction or with cyclooctyne (BCN/DBCO) via copper-free click chemistry. Please contact us for GMP-grade inquiries. Synonyms: Biotin-PEG1-azide; 1204085-48-2; N-[2-(2-Azidoethoxy)ethyl]-biotinamide; BIOTIN-PEG-AZIDE; SCHEMBL23947625; DTXSID701118138; 5-[(3aS,4S,6aR)-2-oxo-hexahydro-1H-thieno[3,4-d]imidazol-4-yl]-N-[2-(2-azidoethoxy)ethyl]pentanamide; AKOS040756543. Molecular formula: C14H24N6O3S. Mole weight: 356.45.
Biotin-PEG-Biotin
Biotin-PEG-Biotin is a PEG-based PROTAC linker that can be used in the synthesis of PROTACs [1]. Uses: Scientific research. Group: Signaling pathways. CAS No. 194920-55-3. Pack Sizes: 5 mg; 10 mg; 25 mg; 50 mg; 100 mg. Product ID: HY-140656A.
Biotin-PEG-Biotin, MW 600-35k
Biotin-PEG-Biotin has two activated terminal groups. Biotin groups are often used in labeling. Homobifunctionalized PEG derivatives have wide applications in peptides, proteins, lipids, other small molecules and surface modifications. Drug PEGylation can alter its dispersity and solubility in aqueous solutions. PEG modification can create a spatial barrier around the drug, reduce the enzymatic hydrolysis of the drug, avoid the rapid elimination of kidney metabolism, and allow the drug to be recognized by cells of the immune system. Synonyms: Biotin-PEG-Biotin; SCHEMBL15216220; Biotin-PEG-Biotin, MW 1,000; Biotin-PEG-Biotin, MW 2,000; Biotin-PEG-Biotin, MW 3,400; Biotin-PEG-Biotin, MW 5,000; Biotin-PEG-Biotin, MW 10,000; HY-140656A. Molecular formula: C26H44N6O6S2. Mole weight: Customizable.
Biotin-PEG-CH2CO2H, MW 1K-10K
Biotin-PEG-CH2CO2H, MW 1,000 is a carboxyl polyPEG used for biotinylation due to its strong binding with avidin/streptavidin. The carboxyl is reactive with amine in the presence of activating agent, such as HATU or EDC, to generate a covalent amide bond. Please contact us for GMP-grade inquiries.
Biotin-PEG-COOH, MW 1k-10k
Biotin-PEG-AC is a linear heterobifunctional PEG reagent with two different activated terminal groups. It is used in cell culture, pharmaceutical research, drug delivery and release, nanotechnology and new materials.Biotin terminal group can label specific molecules, structures or tissues. The other terminal group participates in kinds of active reactions. Biotin-PEG-AC can be used as argeted markers for small molecules or materials. Mole weight: Customizable.
Biotin-PEG-DMG
Biotin-PEG-DMG is a lipid used in the form of lipid nanoparticles. Synonyms: α-Biotin-ω-dimyristoyl glycerol poly(ethylene glycol).
Biotin-PEG-MAL, MW 1k-10k
Biotin-PEG-MAL is a linear heterobifunctional PEGylation reagent with two different activated terminal groups. It is used in cell culture, pharmaceutical research, drug delivery and release, nanotechnology and new materials. Biotin terminal group can label specific molecules, structures or tissues. The other terminal group participates in kinds of active reactions. Biotin-PEG-MAL can be used as argeted markers for proteins or materials. Mole weight: Customizable.
Biotin-PEG-NH2, MW 1k-10k
Biotin-PEG-NH2 is a linear heterobifunctional PEG reagent with two different activated terminal groups. It is used in cell culture, pharmaceutical research, drug delivery and release, nanotechnology and new materials. Biotin terminal group can label specific molecules, structures or tissues. The other terminal group participates in kinds of active reactions. Biotin-PEG-NH2 can be used as argeted markers for proteins or materials. Mole weight: Customizable.
Biotin-PEG-NHS, MW 1k-4k
Biotin-PEG-NHS ester is a heterobifunctional PEG derivative containing a biotin group and an NHS ester group. Mole weight: Customizable.
Biotin-PEG-OH, MW 1k-10k
Biotin-PEG-OH is a linear heterobifunctional PEGylation reagent with two different activated terminal groups. It is used in cell culture, pharmaceutical research, drug delivery and release, nanotechnology and new materials. Biotin terminal group can label specific molecules, structures or tissues. The other terminal group participates in kinds of active reactions. Biotin-PEG-OH can be used as argeted markers for proteins or materials. Mole weight: Customizable.
Biotin-PEG-PLGA
Biotin-PEG-PLGA. Synonyms: Folate-poly(ethylene glycol)-b-poly(lactide-co-glycolide). Product ID: MSMN-047. Category: Raw Materials.
Biotin-PEG-SCM, MW 1k-10k
Biotin-PEG-SCM with two different activated terminal groups, a biotin and a succinimidyl NHS ester. It is used in cell culture, pharmaceutical research, drug delivery and release, nanotechnology and new materials. Biotin terminal group can label specific molecules, structures or tissues. The other terminal group participates in kinds of active reactions. Biotin-PEG-SCM can be used as argeted markers for proteins or materials. Mole weight: Customizable.
Biotin-PEG-SH, MW 1k-10k
Biotin-PEG-SH with two different activated terminal groups is used in cell culture, pharmaceutical research, drug delivery and release, nanotechnology and new materials. Biotin terminal group can label specific molecules, structures or tissues. The other terminal group participates in kinds of active reactions. Biotin-PEG-SH can be used as argeted markers for proteins or materials. Mole weight: Customizable.