9,10-dihydro-9,10-ethenoanthracene-11,12-dicarboxylic acid 9,10-ethenoanthracene-11,12-dicarboxylic acid, 9,10-dihydro- InChI=1/C18H12O4/c19-17(20)15-13-9-5-1-2-6-10(9)14(16(15)18(21)22)12-8-4-3-7-11(12)13/h1-8,13-14H,(H,19,20)(H,21,22