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Ibrahim, M. A.; Hassanin, H. M.; Gabr, Y. A.-A.; Alnamer, Y. A.-S. Novel Heterocyclic Derivatives of pyrano[3,2-c]quinolinone from 3-(1-Ethy1-4-Hydroxy-2-Oxo-2(1H)-Quinolin-3-Yl)-3-Oxopropanoic Acid. Eur. J. Chem. 2010, 1, 195-199.