Crystal structure of (4Z)-4-[(di­methyl­amino)­methyl­idene]-3,5-dioxo-2-phenyl­pyrazolidine-1-carbaldehyde

In the title compound, C(13)H(13)N(3)O(3), 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) Å from the plane through the remaining atoms (r.m.s. deviation = 0.011 Å)]. The dihedral angle between the pyrazolidine ring (all atoms) and the benzene ring is 51.09 (4)°. An extremely short (2.08 Å) intra­molecular C—H⋯O contact is seen. In the crystal, mol­ecules are linked by C—H⋯O bonds, generating [010] chains. Extremely weak C—H⋯π inter­actions are also observed.