Synonyms: Vitamin D3, 1a,25-Dihydroxy-; 1alpha,25-Dihydroxyvitamin D3; 1a,25-Dihydroxyvitamin; 1alpha,25-dihydroxycholecalciferol; (5z,7e)-(1s,3r)-9,10-secocholesta-5,7,10(19)-triene-1,3,25-triol; 1α,25-dihydroxycholecalciferol; Calcitriol; 1,25-dihydroxyvitamin D3