19-Nor-17a-pregn-5(10)-ene-21-carboxylicacid, 17-hydroxy-11b-methyl-3-oxo-, g-lactone (8CI); Spiro[17H-cyclopenta[a]phenanthrene-17,2'(5'H)-furan],19-norpregn-5(10)-ene-21-carboxylic acid deriv.; 3-(3-Oxo-11b-methyl-17b-hydroxyestr-5(10)-en-17a-yl)propionic acid g-lactone
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