维生素 D3

4-(3-acetyloxy-10,13-dimethyl-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoic acid

methyl 3-acetoxy-23a-homo-5-cholen-24-oate

Methyl-3β-acetoxy-homochola-5,7-dien-25-oat