CAS 20904-30-7 appears in our catalog under these names: 2-(4-Nitrophenylthio)benzoic acid, 95%, 2-((4-Nitrophenyl)thio)benzoic acid, 2-(4-Nitrophenylthio)benzoic acid. Offered by: Combi-blocks, Biosynth, Fluorochem. Available pack sizes: 1g, 5g, 1000mg, 2000mg.