CAS 858128-57-1 appears in our catalog under these names: Succinimidyl-(4-(psoralen-8-yloxy))butyrate, SPB, 98%, 98%, SPB, 98.20%, SPB, 98%. Offered by: Biosynth, Chemat, MedChemExpress, Fluorochem. Available pack sizes: 50mg, 10mg, 25mg, 100mg, 250mg, 5 mg, 10 mg, 25 mg.