3,4-dimethylbicyclo[4.2.0]octa-1(6),3-diene-7,8-dione InChI=1/C10H10O2/c1-5-3-7-8(4-6(5)2)10(12)9(7)11/h3-4H2,1-2H bicyclo[4.2.0]octa-1(6),3-diene-7,8-dione, 3,4-dimethyl-