N′-[3-(Hy­droxy­imino)­butan-2-yl­idene]-4-methyl­benzene-1-sulfono­hydrazide

In the title compound, C₁₁H₁₅N₃O₃S, the C—S—N(H)—N linkage is nonplanar, the torsion angle being 75.70 (12)°. The compound has two almost planar fragments linked to the S atom: the hydrazone-derivative fragment [(HONC₄H₆)N—N(H)–] and the tolyl fragment (C₇H₇–) have maximum deviations from the mean plane through the non-H atoms of 0.0260 (10) and 0.0148 (14) Å, respectively. The two planar fragments make an inter­planar angle of 79.47 (5)°. In the crystal, mol­ecules are connected through inversion centers via pairs of N—H...O and O—H...N hydrogen bonds.