Synonyms: Spiro[16H-cyclopenta[a]phenanthrene-16,5'-[1,3]dioxane],spiro[1,3-dioxane-5,16'-estrane] deriv.; Spiro[16H-cyclopenta[a]phenanthrene-16,5'-[1,3]dioxane],hexadecahydro-13-methyl-, [8R-(8a,9b,10a,13a,14b)]-; [8R-(8a,9b,10a,13a,14b)]-Hexadecahydro-13-methylspiro[16H-cyclopenta[a]phenanthrene-16,5'-[1,3]dioxane]