13β-ethyl-gona-5-ene-3,11,17-trione-3,17-diethylene ketal

13-ethyl-11β-hydroxygon-5-ene-3,17-dione cyclic bis(1,2-ethanediyl acetal)

3,3:17,17-bis[1,2-ethenediylbis(oxy)]-11β-hydroxyestr-5-en-18-oic acid γ-lactone

17,17-(2,2-dimethyl)propane-1,3-dioxyl-13β-ethyl-11-oxo-3-methoxy-gona-1,3,5-triene