Tos-Pro-OH contains a proline amino acid scaffold bearing an N-(p-toluenesulfonyl) (tosyl) protecting group, making it an amino acid derivative rather than an unprotected free amino acid. The molecule presents a carboxylic acid functional group and a sulfonamide-linked nitrogen that constrains the proline ring's secondary amine reactivity, with stereochemistry not specified in the product name. Tos-Pro-OH is used as a protected proline building block in peptide synthesis and related coupling studies, where the tosyl group helps control chemoselectivity during stepwise assembly of proline-containing sequences and intermediates.
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