estrazinol estrazinol estrazinol (inn), or as estrazinol hydrobromide (usan) (developmental code name w-4454a), also known as 3-methoxy-8-aza-19-norpregna-1,3,5(10)-trien-20-yn-17-ol, is a synthetic, steroidal estrogen that was synthesized in 1968 and further characterized in 1973 but was never marketed. it is described as a water-soluble estrogen. estrazinolidentifiers iupac name (1r,3ar,10br,12as)-1-ethynyl-8-methoxy-12a-methyl-1,2,3,3a,5,6,10b,11,12,12a-decahydrocyclopentapyridoisoquinolin-1-ol cas number5941-36-6 15179-97-2 (hbr)pubchem cid10018368chemspider8193941unii9klu2e3573chemblchembl2110830comptox dashboard (epa)dtxsid10208136 chemical and physical dataformulac20h25no2molar mass311.425 g·mol−13d model (jsmol)interactive image smiles cc12ccc3c4=c(ccn3c1ccc2(c#c)o)c=c(c=c4)oc inchi inchi=1s/c20h25no2/c1-4-20(22)11-8-18-19(20,2)10-7-17-16-6-5-15(23-3)13-14(16)9-12-21(17)18/h1,5-6,13,17-18,22h,7-12h2,2-3h3/t17-,18-,19+,20+/m1/s1key:nthojxsfnbudmy-zrnyenfqsa-n