(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

17β-Hydroxy-A-nor-5α-oest-1(10)-en-2-on

17β-tert-Butoxy-A-nor-3(5)-oestren-2-on

17β-tert-Butoxy-3,5-seco-A-nor-2,5-oestrandion