Tosyl-S-Benzyl-L-cysteine is a protected L-cysteine derivative in which the thiol side chain is modified to a thioether bearing a benzyl group, while the amino acid functionality is further protected by a tosyl (p-toluenesulfonyl) group on the sulfur atom. The molecule contains an α-amino group and a carboxyl group characteristic of cysteine derivatives, with the side-chain thioether substituent providing controlled chemoselectivity by masking the native cysteine thiol reactivity. It is used as a cysteine building block in peptide synthesis and related derivatization workflows where stable sulfur protection and stepwise assembly of sulfur-containing peptide structures or analytical standards are required.
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Creative Peptides is a trusted CDMO partner specializing in high-quality peptide synthesis, conjugation, and manufacturing under strict cGMP compliance. With advanced technology platforms and a team of experienced scientists, we deliver tailored peptide solutions to support drug discovery, clinical development, and cosmetic innovation worldwide.
From custom peptide synthesis to complex peptide-drug conjugates, we provide flexible, end-to-end services designed to accelerate timelines and ensure regulatory excellence. Our commitment to quality, reliability, and innovation has made us a preferred partner across the pharmaceutical, biotechnology, and personal care industries.
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