CAS 68181-17-9 appears in our catalog under these names: 3-(2-Pyridyldithio)propionic Acid N-Succinimidyl Ester, >95% (HPLC), SPDP/ 100%, SPDP (SPDP Crosslinker), 3-(2-Pyridyldithio)propionic acid N-succinimidyl ester, SPDP (2mg*5). Offered by: TRC, TargetMol, GLPBio, Biosynth, TCI. Available pack sizes: 1g, 2,5g, 500mg, 5mg, 10mg, 25mg, 50mg, 100mg.