Synonyms: 9,10-Secocholesta-5,7,10(19)-trien-3beta-ol; Cholecalciferol, USP Grade 9,10-Secocholesta-5,7,19(19)-trien-3-OL-(3B,5Z,7E)-choleciferol, USP Grade; vitamin D3 ~40000 U/mg; colecalciferol; VitaminD; Cholecalciferol; 7-dehydrogenase cholesterol