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In the title compound, C19H18N2O3, the pyrazoline ring is close to being planar (r.m.s. deviation = 0.035 Å) and subtends dihedral angles of 2.11 (8) and 82.63 (8)° with the p-tolyl and benzene rings, respectively. In the crystal, C—H...O and C—H...N hydrogen bonds link the mol­ecules, forming a three-dimensional network. A weak C—H...π inter­action involving the benzene ring is also observed.

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The asymmetric unit of the title compound, C11H11N5O2S·0.5C4H8O2, contains one 3-(p-tol­yl)sydnone 4-thio­semi­carba­zone mol­ecule and a half mol­ecule of 1,4-dioxane, which lies abount an inversion centre. The sydnone ring is almost planar, with a maximum deviation of 0.002 (1) Å, and forms a dihedral angle of 46.31 (5)° with the benzene ring. In the crystal, the two components are linked into a tape along [01-1] by N—H...O and N—H...S hydrogen bonds. The crystal structure is further stabilized by C—H...O and C—H...π inter­actions, forming a three-dimensional network.
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