estrane estrane estrane is a c18 steroid derivative, with a gonane core. estrane names iupac name 5ξ-estrane systematic iupac name (3as,3br,5aξ,9as,9br,11as)-11a-methylhexadecahydro-1h-cyclopentaphenanthrene identifiers cas number 24749-37-9 n 3d model (jsmol) interactive image beilstein reference 3125721 chebi chebi:23966 n chemspider 11179505 y4574149 (1r,2s,10r,11s,15s)-15-methyl,heptadec y5256802 (1r,2s,7r,10r,11s,15s)-15-methyl,heptadec y5256794 (1r,2s,7s,10r,11s,15s)-15-methyl,heptadec y pubchem cid 123136945460658 (1r,2s,10r,11s,15s)-15-methyl,heptadec6857465 (1r,2s,7r,10r,11s,15s)-15-methyl,heptadec6857457 (1r,2s,7s,10r,11s,15s)-15-methyl,heptadec comptox dashboard (epa) dtxsid60420109 inchi inchi=1s/c18h30/c1-18-11-4-7-17(18)16-9-8-13-5-2-3-6-14(13)15(16)10-12-18/h13-17h,2-12h2,1h3 ykey: grxpvlpqnmunnx-uhfffaoysa-n y smiles cc12cccc1c1ccc3ccccc3c1cc2 properties chemical formula c18h30 molar mass 246.438 g·mol−1 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 not to be confused with estrone. estrenes are estrane derivatives that contain a double bond, with an example being nandrolone. estratrienes (estrins) are estrane derivatives that contain three double bonds, for instance estrin (estra-1,3,5(10)-triene). the estrogen steroid hormones estradiol, estrone, and estriol are estra-1,3,5(10)-trienes.