7,7'-dihydroxy-2H,2'H-[2,2']bi[benzo[1,4]thiazinyl]-3,3'-dicarboxylic acid diethyl ester

联苯甲酰

4,4′-二甲氧基苯偶酰

1,4-benzoquinone monothioglycolic acid

(2,5-二羟基苯基)-苯基甲酮