2,4-benzofurandione, 7,7a-dihydro-3,7,7-trimethyl- 3,7,7-trimethyl-7,7a-dihydro-1-benzofuran-2,4-dione InChI=1/C11H12O3/c1-6-8-7(12)4-5-11(2,3)9(8)14-10(6)13/h4-5,9H,1-3H