3-cyclohexene-1,2-dione, 4,6,6-trimethyl- 4,6,6-trimethylcyclohex-3-ene-1,2-dione InChI=1/C9H12O2/c1-6-4-7(10)8(11)9(2,3)5-6/h4H,5H2,1-3H