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(2R,4R)-4-hydroxypyrrolidine-2-carboxylic acid hydrochloride; CAS No.: 77449-94-6; (2R,4R)-4-Hydroxypyrrolidine-2-carboxylic acid hydrochloride, a chiral pyrrolidine, underscores our **pharma building blocks** for antibiotic and antiviral prodrugs. The hydroxyl and carboxylic acid groups enable bifunctional conjugation. As a **custom synthesis company**, we deliver enantiopure intermediates for peptide-mimetic therapies, with chiral SFC validation ensuring >99% diastereomeric excess.