Norgestimate

Chemical Name: (3EZ)-13β-Ethyl-3-(hydroxyimino)-18,19-dinor-17α-pregn-4-en-20-yn-17-yl acetate (as per EP) ; 18,19-Dinor-17-pregn-4-en-20-yn-3-one, 17-(acetyloxy)-13-ethyl-, oxime, (17α)-(+)-; (as per USP)

Synonym: 5-Prop-2-en-1-ylidene-10,11-dihydro-5H-dibenzo[a,d][7]annulene