1,6(2H,7H)-naphthalenedione, 3,4,8,8a-tetrahydro-3,3,8a-trimethyl- 3,3,8a-trimethyl-3,4,8,8a-tetrahydronaphthalene-1,6(2H,7H)-dione InChI=1/C13H18O2/c1-12(2)7-9-6-10(14)4-5-13(9,3)11(15)8-12/h6H,4-5,7-8H2,1-3H