(3aS,3bR,5aS,8bS,10aS)-10a-Methyl-2,3,3a,3b,4,5,5a,6,8b,9,10,10a-dodecahydro-dicyclopenta[a,f]naphthalene-1,7-dione

5-(2-Methyl-[1,3]dioxolan-2-yl)-2-((3aS,4S,7aS)-7a-methyl-1,5-dioxo-octahydro-inden-4-ylmethyl)-3-oxo-pentanoic acid methyl ester

(+)-11β-hydroxy-4-nor-3,5-secoestr-9-ene-3,5,17-trione ethylene 3-acetal

(+)-4-nor-3,5-secoestr-9-ene-2,5,17-trione ethylene 2-acetal

(4aR,4bS,10aS)-10a-Methyl-8-(2-methyl-[1,3]dioxolan-2-ylmethyl)-3,4,4a,5,6,9,10,10a-octahydro-2H,4bH-phenanthrene-1,7-dione