5,7-bis(methylsulfonyl)-9-oxoxanthene-2-carboxylic acid

四氢-1,2-二噻英

5-(羟基甲基)吡啶甲酸乙酯

ethyl 5-hydroxy-4-oxochromene-2-carboxylate

1-phenyl-3-[2-(phenylcarbamothioylamino)phenyl]thiourea