2-Amino-6-methoxy-4,5-di(methoxycarbonyl)pyridine and 2-Amino-4,5-di(methoxycarbonyl)-6-methylthiopyridine

The title compounds, dimethyl 5-amino-1-methoxy-2,3-pyridinedicarboxylate, C₁₀H₁₂N₂O₅, and dimethyl 5-amino-1-methylthio-2,3-pyridinedicarboxylate, C₁₀H₁₂N₂O₄S, are not isomorphous but have similar packing and hydrogen-bonding patterns. Both structures contain hydrogen-bonded ribbons, with van der Waals contacts between the ribbons.

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