The title compound, C13H15N3O4, occurs as two stereoisomers. The Z and
E isomers both display potent relaxant activity, Crystal structure an
alysis clearly demonstrates that the studied isomer, the less active f
orm, adopts the Z conformation. The molecules are held together by N-H
... O hydrogen bonds and intermolecular ring-to-ring interactions for
ming head-to-tail hydrogen-bonded dimers and a layered pi-stacking arr
angement.