1H-Cyclobut[a]indene-1,2-dicarboxylicanhydride, 2,2a,7,7a-tetrahydro- (8CI); 1H-Indeno[1',2':3,4]cyclobuta[1,2-c]furan-1,3(3aH)-dione,3b,8,8a,8b-tetrahydro- (9CI); 1H-Cyclobut[a]indene-1,2-dicarboxylic anhydride
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