(3S,3aS,9aS,9bS)-3-tert-Butoxy-3a-methyl-7-oxo-6-(2,5,5-trimethyl-[1,3]dioxan-2-ylmethyl)-2,3,3a,4,5,7,8,9,9a,9b-decahydro-1H-cyclopenta[a]naphthalene-8-carboxylic acid

13-Ethyl-3,5-seco-A-nor-9-gonen-2,5,17-trion

(+)-4-nor-3,5-secoestrane-2,5,17-trione

2-((1S,3aS,4S,7aS)-1-tert-Butoxy-7a-methyl-5-oxo-octahydro-inden-4-ylmethyl)-3-oxo-5-(2,5,5-trimethyl-[1,3]dioxan-2-yl)-pentanoic acid methyl ester

(-)-18-homo-4-norestr-3(5)-ene-2,17-dione