A co-crystal of nona­hydrated disodium(II) with mixed anions from m-chloro­benzoic acid and furosemide

In the title compound, [Na(2)(H(2)O)(9)](C(7)H(4)ClO(2))(C(12)H(10)ClN(2)O(5)S) {systematic name: catena-poly[[[triaquasodium(I)]-di-μ-aqua-[triaquasodium(I)]-μ-aqua] 3-chlorobenzoate 4-chloro-2-[(furan-2-ylmethyl)amino]-5-sulfamoylbenzoate]}, both the original m-chloro­benzoic acid and furosemide exist with deprotonated carboxyl­ates, and the sodium cations and water mol­ecules exist in chains with stoichiometry [Na(2)(OH(2))(9)](2+) that propagate in the [-110] direction. Each of the two independent Na(+) ions is coordinated by three monodentate water mol­ecules, two double-water bridges, and one single-water bridge. There is considerable cross-linking between the [Na(2)(OH(2))(9)](2+) chains and to furosemide sulfonamide and carboxyl­ate by inter­molecular O—H⋯O hydrogen bonds. All hydrogen-bond donors participate in a complex two-dimensional array parallel to the ab plane. The furosemide NH group donates an intra­molecular hydrogen bond to the carboxyl­ate group, and the furosemide NH(2) group donates an intra­molecular hydrogen bond to the Cl atom and an inter­molecular one to the m-chloro­benzoate O atom. The plethora of hydrogen-bond donors on the cation/water chain leads to many large rings, up to graph set R (4) (4)(24), involving two chains and two furosemide anions. The chloro­benzoate is involved in only one R (2) (2)(8) ring, with two water mol­ecules cis-coordinated to Na. The furan O atom is not hydrogen bonded.