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1 Rocio J. Santos-Contreras, Francisco J. MartÃnez-MartÃnez, Efrén V. GarcÃa-Báez, Itzia I. Padilla-MartÃnez, Ana L. Peraza and Herbert Höpfl .
Carbonyl-carbonyl, carbonyl-[pi] and carbonyl-halogen dipolar interactions as the directing motifs of the supramolecular structure of ethyl 6-chloro-2-oxo-2H-chromene-3-carboxylate and ethyl 6-bromo-2
-oxo-2H-chromene-3-carboxylate , Acta Cryst (2007). C63, o239-o242 Â Â