Patent ID: 7524980

Claim:
A vitamin D 3 derivative expressed by the following formula (1) [wherein, R 1 is selected from an octyl group, a 3-phenylpropyl group, a 4-phenylbutyl group, a 2-naphthylmethyl group, and a 4-methoxybenzyl group], or a pharmaceutically permissible solvate thereof, wherein the solvent used to convert the vitamin D 3 derivative of formula (1) into a solvate is water, methanol, ethanol, 1-propanol, 2propanol, butanol, 2-methyl-2propanol, acetonitrile, acetone, methyl ethyl ketone, chloroform, ethyl acetate, diethyl ether, t-butyl methyl ether, benzene, toluene, DMF or DMSO.