(4E,6E)-1,7-diphenyl-hepta-4,6-dien-3-one DAH-3-keto-4,6-dien InChI=1/C19H18O/c20-19(16-15-18-11-5-2-6-12-18)14-8-7-13-17-9-3-1-4-10-17/h1-14H,15-16H2/b13-7+,14-8