Ortho Phthalaldehyde (CAS No: 643-79-8

Ortho Phthalaldehyde (OPA), with the CAS number 643-79-8, is a chemical compound with the formula C6H4(CHO)2. It is a pale yellow solid, soluble in water at pH < 11.5, and used in various applications including pre-column derivatization of amino acids for HPLC and as a high-level disinfectant.