Synonyms: 15H-Cyclopropa[4,5]cyclopenta[a]phenanthrene,cycloprop[4,5]estrane deriv.; 1H-Cyclopropa[4,5]cyclopenta[a]phenanthrene,2,3,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-13-methyl-, [8R-(8a,9b,10a,13a,14b)]-; Estrano[4,5]cyclopropene; [8R-(8a,9b,10a,13a,14b)]-2,3,6,7,8,9,10,11,12,13,14,15,16,17-Tetradecahydro-13-methyl-1H-cyclopropa[4,5]cyclopenta[a]phenanthrene