dihydrotachysterol dihydrotachysterol dihydrotachysterol (dht) is a synthetic vitamin d analog activated in the liver that does not require renal hydroxylation like vitamin d2 (ergocalciferol) and vitamin d3 (cholecalciferol). dht has a rapid onset of action (2 hours), a shorter half-life, and a greater effect on mineralization of bone salts than does vitamin d. not to be confused with dihydrotestosterone. dihydrotachysterolclinical dataahfs/drugs.commicromedex detailed consumer informationmedlineplusa682335atc codea11cc02 (who) identifiers iupac name (1s,3e,4s)-3--7a-methyl-2,3,3a,5,6,7-hexahydro-1h-inden-4-ylidene]ethylidene]-4-methylcyclohexan-1-ol cas number67-96-9 ypubchem cid5311071drugbankdb01070 ychemspider4470607 yuniir5lm3h112rkeggd00299 ychebichebi:4591 ycomptox dashboard (epa)dtxsid5022938 echa infocard100.000.611 chemical and physical dataformulac28h46omolar mass398.675 g·mol−13d model (jsmol)interactive image smiles o3c/c(=c\c=c1/ccc2(1cc2(/c=c/(c)c(c)c)c)c)(c)cc3 inchi inchi=1s/c28h46o/c1-19(2)20(3)9-10-22(5)26-15-16-27-23(8-7-17-28(26,27)6)12-13-24-18-25(29)14-11-21(24)4/h9-10,12-13,19-22,25-27,29h,7-8,11,14-18h2,1-6h3/b10-9+,23-12+,24-13+/t20-,21-,22+,25-,26+,27-,28+/m0/s1 ykey:ilycwaksdcymbb-opcmsescsa-n y (verify)