CAS 503538-70-3 appears in our catalog under these names: (S)-5,5'-Bis(diphenylphosphino)-2,2,2',2'-tetrafluoro-4,4'-bi-1,3-benzodioxole 98% +99%ee, (S)-5,5'-Bis(diphenylphosphino)-2,2,2',2'-tetrafluoro-4,4'-bi-1,3-benzodioxole, 98% +99%ee, 98% +99%ee, (S)-DIFLUORPHOS, 97%. Offered by: Ambeed, Chemat, Fluorochem. Available pack sizes: 100mg, 250mg, 1g, 5g, 50mg, 500mg.