5,6-trans-Vitamin D3(5,6-trans-Cholecalciferol) is an isoform of Vitamin D3, which is converted from Vitamin D3 on the skin surface after light exposure.
(24S)-24,25-Dihydroxyvitamin D3 ((24S)-24,25-Dihydroxycholecalciferol) has some bone calcium mobilizing activity and stimulates intestinal calcium transport.
24, 25-Dihydroxy VD2 (24,25-Dihydroxy vitamin D2) is a metabolite of vitamin D2, which is the isomer of vitamin D present in the body as 25-hydroxyvitamin D. PF-04957325 is used in the study of autoimmune encephalomyelitis.