Calcifediol (INN), also known as calcidiol, 25-hydroxycholecalciferol, or 25-hydroxyvitamin D (abbreviated 25(OH)D), is a prehormone that is produced in the liver by hydroxylation of vitamin D3 (cholecalciferol) by the enzyme cholecalciferol 25-hydroxylase which was isolated by Michael F. Holick. Physicians worldwide measure this metabolite to determine a patient's vitamin D status. At a typical daily intake of vitamin D3, its full conversion to calcifediol takes approximately 7 days.

CAS：19356-17-3
中文别名：25-羟基维生素D3;骨化三醇;
英文别名：25-Hydroxycholecalciferol;Calcidiol,Didrogyl,Hidroferol;Calcifediol;Vitamin D3 25 Calcifediol;Calcifediol,(εR,1R,3aS,4E,7aR)-4-[(2Z)-2-[(5S)-5-hydroxy-2-methylenecyclohexylidene]ethylidene]octahydro-α,α,ε,7a-tetramethyl-1H-indene-1-pentanol;25-Hydroxyvitamin D3;
分子式：C27H44O2
分子量：400.637
精确质量：400.334
Psa：40.46
Logp：6.7339

MDL号：MFCD00867077
PubChem号：24895612
EINECS号：242-990-9

密度：1.01 g/cm3
沸点：529.2ºC at 760 mmHg
闪点：221.4ºC
储存条件：-20ºC

安全说明：28-36/37-45
WGK Germany：3
危险类别码：R28
危险品运输编码：UN 2811 6
危险品标志：T+
危险标志：GHS02, GHS07
危险性描述：H225; H319
危险性防范说明：P210; P280; P305 + P351 + P338; P337 + P313; P403 + P235
信号词：Danger