CAS 57683-72-4 appears in our catalog under these names: Bsocoes, 95%, Bis(2-(succinimidooxycarbonyloxy)ethyl) Sulfone, Bis(2–(N–succinimidyl–oxycarbonyloxy)ethyl) sulfon, Bis[2-(succinimidooxycarbonyloxy)ethyl] sulfone. Offered by: Combi-blocks, TRC, GLPBio, Biosynth, MedChemExpress. Available pack sizes: 100mg, 250mg, 25mg, 10mg, 50mg, 50 mg, 10 mg, 100 mg.