3,5,8-trimethylcyclopenta[ef]heptalene InChI=1/C17H16/c1-11-4-5-14-6-7-16-13(3)8-12(2)10-15(9-11)17(14)16/h4-10H,1-3H cyclopenta[ef]heptalene, 3,5,8-trimethyl-