Synonyms: 4,19-Cyclo-A-dihomo-2-oxaandrost-4b-ene-4a,17-dione,(4a,10a)-; 2,19-(methyleneoxy)androst-4-ene-3,17-dione;6H-3,6a-Methanocyclopenta[5,6]naphth[1,2-c]oxocin-2,9-dione,3,4,6b,7,8,8a,10,11,11a,11b,12,13-dodecahydro-8a-methyl-, [3R-(3a,6aa,6ba,8ab,11aa,11bb)]-; MDL 101003