CAS 1821-12-1 appears in our catalog under these names: Phenylbutyrate, 4-Phenylbutyric Acid, >95% (HPLC), 4-Phenylbutyric acid/ 99.76% (existing batch purity), Benzenebutyric acid (4–Phenylbutyric acid), 4-Phenylbutyric acid, 99% . Offered by: Chemat Brand, TRC, TargetMol, GLPBio, Thermo Scientific (Alfa Aesar). Available pack sizes: on request, 2,5g, 500mg, 10mM (in 1ml dmso), 5g, 25g, 100g, 500g.