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10Synthesis, Characterization and Structural Conformation Studies of 2-Amino-3-ethoxycarbonyl-4-(4u2032-methoxy Phenyl)-4H-pyrano-[3,2-c]-chromene-6-methyl-5-one, Journal of Chemical Crystallography Chemical shifts and coupling constants of C10H8O3, Chemical Shifts and Coupling Constants for Carbon-13