19-nor-4-androstene-3,17-dione. C18H24O2 [eCrystal] Wood, Kenneth J and Fronckowiak, M and Duax, William L and Hursthouse, Michael B. and Lamond, Steven J. and Surplice, Luke (1987) (doi:10.3737/ecrystals.chem.soton.ac.uk/1231)