6-methylspiro[4.4]nona-2,6-dien-1-one InChI=1/C10H12O/c1-8-4-2-6-10(8)7-3-5-9(10)11/h3-5H,2,6-7H2,1H spiro[4.4]nona-2,6-dien-1-one, 6-methyl-