ethyl 4-oxochromen-2-carboxylate, 4-Oxo-4H-chromen-2-carbonsaeure-aethylester, 4-oxo-4H-chromene-2-carboxylic acid ethyl ester, Ethyl 4-oxo-4H-1-benzopyran-2-carboxylate, ethyl 4-oxo-4H-chromene-2-carboxylate, Chromone-2-carboxylic acid ethyl ester, 2-ethyloxycarbonyl-chromone, 4H-1-BENZOPYRAN-2-CARBOXYLIC ACID,4-OXO-,ETHYL ESTER, ethyl chromone-2-carboxylate