1722-54-9 19-Nor-17alpha-pregn-4-ene-21-carboxylic acid, 17-hydroxy-3-oxo-, gamma-lactone (8CI) 19-Norpregn-4-ene-21-carboxylic acid, 17-hydroxy-3-oxo-, gamma-lactone, (17alpha)- (9CI) NSC 70586 SC 8109