CAS 2150-43-8 appears in our catalog under these names: Methyl 3,4-dihydroxybenzoate, 3,4-Dihydroxybenzoic Acid Methyl Ester, >95% (HPLC), 3,4-Dihydroxybenzoic acid-methyl ester, Methyl 3,4-dihydroxybenzoate/ 100%, Methyl 3,4–dihydroxybenzoate (Protocatechuic acid methyl ester). Offered by: Chemat Brand, TRC, Dr. Ehrenstorfer, TargetMol, GLPBio. Available pack sizes: on request, 1g, 50mg, 100mg, 10mM (in 1ml dmso), 2g, 10g, 0,5kg.