6-nitro-4-oxo-4H-chromene-2-carboxylic acid ethyl ester, ethyl 6-nitrochromone-2-carboxylate, ethyl 6-nitro-4-oxo-4H-chromene-2-carboxylate, 4H-1-Benzopyran-2-carboxylic acid,6-nitro-4-oxo-,ethyl ester, 6-Nitro-4-oxochromen-2-carbonsaeureethylester, ethyl 6-nitro-4-oxo-4H-1-benzopyran-2-carboxylate, EINECS 250-047-8