Dimethyl and diethyl esters of 5,6-bis-(pyridin-2-yl)pyrazine-2,3-di-carb-oxy-lic acid: a comparison

DOI: 10.1107/S2056989016001080

Keywords: crystal structure, dimethyl, diethyl, dicarboxylic acid, pyrazine, pyridine, C—H？O and C—H？N hydrogen bonding

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