Some 2,3-fused diaza-heterocycles of estra-1,3,5(10)-trien-17-one.
D055598:Chemical Phenomena; D002621:Chemistry; D002855:Chromatography, Thin Layer; D004962:Estranes; D004970:Estrone; D007259:Infrared Rays; D009682:Magnetic Resonance Spectroscopy; D013057:Spectrum Analysis; D014466:Ultraviolet Rays
D004962:Estranes; D004970:Estrone