(2E,5E)-5,6,7-trimethylnona-2,5-dien-4-one 2,5-nonadien-4-one, 5,6,7-trimethyl-, (2E,5E)- InChI=1/C12H20O/c1-6-8-12(13)11(5)10(4)9(3)7-2/h6,8-9H,7H2,1-5H3/b8-6+,11-10