Synonyms: Spiro[3H-cyclopenta[a]phenanthrene-3,2'-thiazolidine],spiro[estrane-3,2'-thiazolidine] deriv.; Spiro[3H-cyclopenta[a]phenanthrene-3,2'-thiazolidine],hexadecahydro-13-methyl-, [8R-(8a,9b,10a,13a,14b)]-; [8R-(8a,9b,10a,13a,14b)]-Hexadecahydro-13-methylspiro[3H-cyclopenta[a]phenanthrene-3,2'-thiazolidine]