CAS 503538-68-9 appears in our catalog under these names: (S)–6,6'–Bis(diphenylphosphino)–2,2',3,3'–tetrahydro–5,5'–bibenzo(b)(1,4)dioxine, (S)-6,6'-Bis(diphenylphosphino)-2,2',3,3'-tetrahydro-5,5'-bibenzo[b][1,4]dioxine 95%, (S)-6,6'-Bis(diphenylphosphino)-2,2',3,3'-tetrahydro-5,5'-bibenzo[b][1,4]dioxine, 97%, 97%, (S)-SYNPHOS, 97%. Offered by: GLPBio, Ambeed, Chemat, Fluorochem. Available pack sizes: 1g, 250mg, 50mg, 100mg, 5g.