2,2'-(2,5-dihydroxy-3,6-dioxo-cyclohexa-1,4-diene-1,4-diyl)-di-benzoic acid dimethyl ester

benz[c]isochromeno[3,4-g]chromene-5,7,12,14-tetraone

邻氨基苯甲酸

苯醌

邻溴苯甲酸甲酯