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In the title compound, C16H17N3O4, the six-membered N-containing ring adopts a half-chair conformation. One C atom of the five-membered ring is disordered over two sites, with occupancy factors of ca 0.67 and 0.33. The major pyrroline component adopts a half-chair conformation. Inter­molecular C—H...O hydrogen bonds forming centrosymmetric dimers are observed in the crystal.
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