Synonyms: Spiro[17H-cyclopenta[a]phenanthrene-17,5'-oxazolidine],spiro[estrane-17,5'-oxazolidine] deriv.; Spiro[17H-cyclopenta[a]phenanthrene-17,5'-oxazolidine],hexadecahydro-13-methyl-, [8R-(8a,9b,10a,13a,14b)]-; [8R-(8a,9b,10a,13a,14b)]-Hexadecahydro-13-methylspiro[17H-cyclopenta[a]phenanthrene-17,5'-oxazolidine]