CAS 33996-33-7 appears in our catalog under these names: Ac-Hyp-OH, 95%, 1-Acetyl-4-hydroxy-pyrrolidine-2-carboxylic acid, 95%, Oxaceprol, Oxaceprol/ 98%, Ac-L-trans-Hyp-OH. Offered by: Combi-blocks, Chemat Brand, TargetMol, Iris Biotech, Thermo Scientific (Alfa Aesar). Available pack sizes: 1g, 5g, 25g, 100g, 500g, on request, 200mg, 2g.