CAS 3376-83-8 appears in our catalog under these names: Biotin (R)-Sulfoxide, (-)-Biotin Sulfoxide, >95% (HPLC), Biotin (R)–Sulfoxide, (-)-Biotin sulfoxide, Biotin sulfoxide, 95.0%. Offered by: Chemat Brand, TRC, GLPBio, Biosynth, MedChemExpress. Available pack sizes: on request, 10mg, 250mg, 50mg, 25mg, 5mg, 100mg, 10 mg.