doxercalciferol doxercalciferol doxercalciferol (or 1-hydroxyergocalciferol, trade name hectorol) is drug for secondary hyperparathyroidism and metabolic bone disease. it is a synthetic analog of ergocalciferol (vitamin d2). it suppresses parathyroid synthesis and secretion. doxercalciferol names iupac name (1s,3r,5z,7e,22e)-9,10-secoergosta-5,7,10,22-tetraene-1,3-diol other names 1-hydroxyergocalciferol; 1-hydroxyvitamin d2; 1α-hydroxyergocalciferol; 1α-hydroxyvitamin d2; hectorol; tsa 840 identifiers cas number 54573-75-0 y 3d model (jsmol) interactive image chebi chebi:4712 chembl chembl1200810 n chemspider 4444554 y drugbank db06410 n echa infocard 100.170.997 iuphar/bps 2790 pubchem cid 5281107 unii 3diz9lf5y9 y comptox dashboard (epa) dtxsid1034214 inchi inchi=1s/c28h44o2/c1-18(2)19(3)9-10-20(4)25-13-14-26-22(8-7-15-28(25,26)6)11-12-23-16-24(29)17-27(30)21(23)5/h9-12,18-20,24-27,29-30h,5,7-8,13-17h2,1-4,6h3/b10-9+,22-11+,23-12-/t19-,20+,24+,25+,26-,27-,28+/m0/s1 ykey: hkxbnhcupkiydm-cgmhzmfxsa-n yinchi=1/c28h44o2/c1-18(2)19(3)9-10-20(4)25-13-14-26-22(8-7-15-28(25,26)6)11-12-23-16-24(29)17-27(30)21(23)5/h9-12,18-20,24-27,29-30h,5,7-8,13-17h2,1-4,6h3/b10-9+,22-11+,23-12-/t19-,20+,24+,25+,26-,27-,28+/m0/s1key: hkxbnhcupkiydm-cgmhzmfxbn smiles o1cc(\c(=c)(o)c1)=c\c=c2/ccc3(2cc3(/c=c/(c)c(c)c)c)c properties chemical formula c28h44o2 molar mass 412.658 g·mol−1 pharmacology atc code h05bx03 (who) except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). n verify (what is yn ?) infobox references docercalciferol is the vitamin d2 analogue of alfacalcidol. it undergoes 25-hydroxylation in the liver to become the active ercalcitriol, without the involvement of kidneys.