CAS 7423-55-4 appears in our catalog under these names: 3-Maleimidopropionic Acid, >95% (HPLC), 3–Maleimido–propionic acid, mal-COOH, 3-Maleimidopropionic acid, 95% , 3-Maleimidopropionic acid. Offered by: TRC, GLPBio, Iris Biotech, Thermo Scientific (Alfa Aesar), Biosynth. Available pack sizes: 1g, 250mg, 5g, 500mg, 25g, 10g, 200mg, 50g.