tiodazosin tiodazosin tiodazosin is an α1-adrenergic receptor antagonist. tiodazosin names preferred iupac name methanone identifiers cas number 66969-81-1 y 3d model (jsmol) interactive image chemspider 54869 pubchem cid 60891 unii fqi0pyj799 y comptox dashboard (epa) dtxsid90217180 inchi inchi=1s/c18h21n7o4s/c1-27-12-8-10-11(9-13(12)28-2)20-17(21-14(10)19)25-6-4-24(5-7-25)16(26)15-22-23-18(29-15)30-3/h8-9h,4-7h2,1-3h3,(h2,19,20,21)key: mulpyfrdyrzmds-uhfffaoysa-n smiles coc1=c(c=c2c(=c1)c(=nc(=n2)n3ccn(cc3)c(=o)c4=nn=c(o4)sc)n)oc properties chemical formula c18h21n7o4s molar mass 431.47 g·mol−1 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references