CAS 6912-67-0 appears in our catalog under these names: H-4-OH-DL-Pro-OH 98%, 4-Hydroxypyrrolidine-2-carboxylic acid, 98%, 98%, Hydroxyproline, 98.0%, 4-Hydroxypyrrolidine-2-carboxylic acid, 98%. Offered by: Ambeed, Chemat, MedChemExpress, Fluorochem. Available pack sizes: 1g, 5g, 25g, 100g, 100mg, 250mg, 10g, 10 g.