Synonyms: Cyclobuta[j]cyclopenta[a]phenanthrene,1'H-cyclobut[4,5]androstane deriv.; 1'H-Androstano[4,5]cyclobutene;Cyclobuta[j]cyclopenta[a]phenanthrene,2a,3,4,5,5a,5b,6,7,7a,8,9,10,10a,10b,11,12-hexadecahydro-5a,7a-dimethyl-,[5R-(5aa,5bb,7aa,10ab,10ba)]-; [5aR-(5aa,5bb,7aa,10ab,10ba)]-2a,3,4,5,5a,5b,6,7,7a,8,9,10,10a,10b,11,12-Hexadecahydro-5a,7a-dimethylcyclobuta[j]cyclopenta[a]phenanthrene