(3Z,8R,10R,13S,17R)-2,2,4,6,6,10-hexadeuterio-13-ethyl-17-ethynyl-3-hydroxyimino-7,8,9,11,12,14,15,16-octahydro-1H-cyclopenta[a]phenanthren-17-ol,"A labelled metabolite of Norgestimate.;Labeled Norgestimate, intended for use as an internal standard for the quantification of Norgestimate by GC- or LC-mass spectrometry.",Norgestimate