"CAS:1763-23-1" . . . "Heptadecafluorooctane-1-sulphonic acid — CAS Identifier: 1763-23-1"@en . "Heptadecafluorooctane-1-sulphonic acid"@en . . . "PFOS (Perfluoro Octane Sulfonate)"@it . . "PFOS (Perfluoro Octane Sulfonate) — Codice CAS: 1763-23-1"@it .