(5-ALPHA,6-ALPHA,7-ALPHA,11-BETA)-DELTA-13,14-SOPHOCARPINE MONOHYDRATE

13,14-Didehydromatridin-15-one, C15H22-N2O.H2O, M(r) = 264.37, orthorhombic, P2(1)2(1)2(1), a = 10.667 (2), b = 16.552 (5), c = 8.116 (1) angstrom, V = 1433.0(6) angstrom3, Z = 4,D(x) = 1.225 g cm-3 Mo Kalpha1, lambda = 0.71069 angstrom, mu = 0.761 cm-1, F(000) = 576, T = 294 K, R = 0.062 for 850 reflections [I > 3sigma(I)]. The matrine-type alkaloid, isolated from the epigeal part of Sophora nuttalliana (syn. sericea) displays the 5alpha,6alpha,7alpha,11beta stereochemistry reported for (-)-sophocarpine. Rings A, B and C are in chair conformation. The water molcule is hydrogen bonded to the carbonyl O atom.