Ethyl 2-[(E)-5-Chloro-2-hydroxy-4-nitrophenylazo]-3-(E)-amino-2-butenoate

The title molecule, C₁₂H₁₃ClN₄O₅, has two intramolecular hydrogen bonds (O1—H11...N3 and N4—H42...N2) and π-electron delocalization in the azoenamine group. Adjacent molecules in the crystal are linked through N—H...O hydrogen bonds and this results in an infinite chain structure.

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