InChI=1/C18H14O2/c1-20-18(19)17-12-11-13-7-5-6-8-14(13)15-9-3-2-4-10-16(15)17/h2-12H,1H benzo[a]heptalene-7-carboxylic acid, methyl ester methyl benzo[a]heptalene-7-carboxylate