CAS 131-55-5 appears in our catalog under these names: Bis(2,4-dihydroxyphenyl)methanone, 98%, 2,2',4,4'-Tetrahydroxybenzophenone, 2,2',4,4'-Tetrahydroxybenzophenone, >95% (HPLC), 2,2',4,4'–Tetrahydroxybenzophenone, 2,2',4,4'-Tetrahydroxybenzophenone, 98+% . Offered by: AmBeed, Dr. Ehrenstorfer, TRC, GLPBio, Thermo Scientific (Alfa Aesar). Available pack sizes: 10g, 250mg, 25g, 5g, 100g, 500g, 50g, 250g.