Acta Cryst. (2006). E62, o4270-o4271  [ doi:10.1107/S1600536806033277 ]

Matrinium picrolonate 0.28-hydrate

B. Tu, Z. Shu, H. M. Zhang, X. J. Ma and Z.-M. Jin

Abstract: The title compound [systematic name: (7aS*,13aR*,13bR*,13cS*)-10-oxo-dodecahydro-1H,5H,8H-dipyrido[2,1-f:3',2',1'-ij][1,6]naphthyridinium 3-methyl-4-nitro-1-(4-nitrophenyl)-5-oxo-2-pyrazolinate 0.28-hydrate], C₁₅H₂₅N₂O⁺·C₁₀H₇N₄O₅^-·0.28H₂O, consists of one matrinium cation [matrine is (7aS,13aR,13bR,13cS)-dodecahydro-1H,5H,8H-dipyrido[2,1-f:3',2',1'-ij][1,6]naphthyridin-10-one], one picrolonate anion and 0.28 water molecules, held together by N-HO and O-HO hydrogen bonds. Disordered C atoms in the ring bearing the carbonyl group of the matrinium cation cause the ring to appear in half-chair and half-boat conformations.

Online 6 September 2006

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