Synonyms: (+)-13-Ethylgon-4-ene-3,17-dione;(+)-13b-Ethylgon-4-ene-3,17-dione;13-Ethylgon-4-ene-3,17-dione;13b-Ethylgon-4-en-3,17-dione;13b-Ethylgon-4-ene-3,17-dione;18-Methyl-19-norandrost-4-ene-3,17-dione;18-Methylestr-4-ene-3,17-dione;(8R,9S,10R,13S,14S)-13-Ethyl-7,8,9,10,11,12,13,14,15,16-decahydro-1H-cyclopenta[a]phenanthrene-3,17(2H,6H)-dione (non-preferred name);