CAS 555-59-9 appears in our catalog under these names: N–PHENYLMALEAMIC ACID, (Z)-4-Oxo-4-(phenylamino)but-2-enoic acid 98%, (Z)-4-Oxo-4-(phenylamino)but-2-enoic acid, 98%, 98%, cis-4-Oxo-4-(phenylamino)but-2-enoic acid, 98%. Offered by: GLPBio, Ambeed, Chemat, Fluorochem. Available pack sizes: 1g, 25g, 5g, 10g, 100mg, 250mg.