title: N'-(2,5-Dihydroxy-benzyl-idene)benzene-sulfonohydrazide.
abstract: In the title compound, C(13)H(12)N(2)O(4)S, the dihedral angle between the two aromatic rings is 89.5 (1)°. In the crystal structure, mol-ecules are linked by O-H⋯O(hydr-oxy) and N-H⋯O(sulfon-yl) hydrogen bonds, forming a ribbon that propagates along the b axis; there is also an intra-molecular O-H⋯N hydrogen bond.
authors.affiliation: Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia.
authors.forename: Hapipah M
authors.initials: HM
authors.lastname: Ali
authors.forename: Juahir
authors.initials: J
authors.lastname: Yusnita
authors.forename: Mohd Razali
authors.initials: MR
authors.lastname: Rizal
authors.forename: Seik Weng
authors.initials: SW
authors.lastname: Ng