3-(2-Acetamido­phen­yl)sydnone

Sydnones are unusual mesoionic compounds containing a five-membered heterocyclic ring. Generally for stability, substitution at the N-3 position by an aromatic fragment is necessary. In the title compound, C(10)H(9)N(3)O(3), the aromatic substitutent is 2-acetamido­phenyl. The two planar ring fragments are twisted relative to one another, with a inter­planar angle of 63.13 (5)°. The mol­ecules are packed into the unit cell via π–π inter­actions between the phenyl rings [inter­planar separation = 3.4182 (4) Å] and between the sydnone rings [inter­planar separation = 3.2095 (4) Å]. N—H⋯O and C—H⋯O hydrogen bonding is also found inter­nally and externally to the mol­ecule.