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(2R,4R)-4-hydroxypyrrolidine-2-carboxylic acid; CAS No.: 2584-71-6; ChemShuttle provides (2R,4R)-4-hydroxypyrrolidine-2-carboxylic acid for constrained peptide synthesis. The cis-diol configuration enables hydrogen bonding while carboxylic acid facilitates coupling. With molecular weight 131.13 and melting point >250 C, it ensures thermal stability in solid-phase synthesis. Our custom synthesis services include Fmoc-protected derivatives.