Tectorigenin monohydrate: an isoflavone from Belamcanda chinensis

Abstract

The title compound [systematic name: 5,7-dihydr-oxy-3-(4-hydroxy-phen-yl)- 6-meth-oxy-4H-chromen-4-one monohydrate], C16H12O6·H2O, is isolated from Belamcanda chinensis and is said to have anti-microbiotic and anti-inflammatory effects. The chromen-4-one system and the benzene ring are inclined at a dihedral angle of 36.79 (6)°. Molecules are linked by inter- and intramolecular O - H⋯O hydrogen bonds.