(4Z)-4-[(2E)-but-2-en-1-ylidene]-2,6,6-trimethylcyclohex-2-en-1-one 2-cyclohexen-1-one, 4-[(2E)-2-butenylidene]-2,6,6-trimethyl-, (4Z)- InChI=1/C13H18O/c1-5-6-7-11-8-10(2)12(14)13(3,4)9-11/h5-8H,9H2,1-4H3/b6-5+,11-7