Synonyms: 1H-Cyclobuta[3,4]cyclopenta[1,2-a]phenanthrene,1'H-cyclobuta[16,17]pregnane deriv.; 1H-Cyclobuta[3,4]cyclopenta[1,2-a]phenanthrene,6b-ethyl-2,3,4,4a,4b,5,6,6a,6b,8a,9,9a,9b,10,11,11a-hexadecahydro-4a,6a-dimethyl-,[4aS-(4aa,4bb,6aa,6ba,9ab,9ba)]-; [4aS-(4aa,4bb,6aa,6ba,9ab,9ba)]-6b-Ethyl-2,3,4,4a,4b,5,6,6a,6b,8a,9,9a,9b,10,11,11a-hexadecahydro-4a,6a-dimethyl-1H-cyclobuta[3,4]cyclopenta[1,2-a]phenanthrene