In the title compound, C13H13N3O3, the pyrazolidine ring adopts a shallow envelope conformation, with the carbonyl C atom closest to the benzene ring as the flap [deviation of 0.126 (1) A ˚ from the plane through the remaining atoms (r.m.s. deviation = 0.011 A ˚ )]. The dihedral angle between the pyrazolidine ring (all atoms) and the benzene ring is ... إقراء المزيد