Synonyms: Cyclobuta[j]cyclopenta[a]phenanthrene,1'H-cyclobuta[4,5]pregnane deriv.; Cyclobuta[j]cyclopenta[a]phenanthrene,8-ethyl-2a,3,4,5,5a,5b,6,7,7a,8,9,10,10a,10b,11,12-hexadecahydro-5a,7a-dimethyl-,[5aR-(5aa,5bb,7aa,8a,10ab,10ba)]-; [5aR-(5aa,5bb,7aa,8a,10ab,10ba)]-8-Ethyl-2a,3,4,5,5a,5b,6,7,7a,8,9,10,10a,10b,11,12-hexadecahydro-5a,7a-dimethylcyclobuta[j]cyclopenta[a]phenanthrene