CAS 1440957-55-0 appears in our catalog under these names: Secalciferol-d6, 24,25 Dihydroxyvitamin d3 (26,26,26,27,27,27-d6), 24R,25-DIHYDROXYVITAMIN D3-26,26,26,27,&. Offered by: TRC, Biosynth, Sigma-Aldrich, MedChemExpress. Available pack sizes: 0,25mg, 10mg, 1mg, 10 mg, 250 μg, 1 mg.