Santal monohydrate, an isoflavone isolated from Wye­thia mollis

The title compound [systematic name: 3-(3,4-di­hydroxy­phen­yl)-5-hy­droxy-7-meth­oxy-4H-chromen-4-one monohydrate], C₁₆H₁₂O₆·H₂O, is a monohydrate of a natural product santal isolated from Wye­thia mollis. In the santal mol­ecule, the dihedral angle between the benzo­quinone and di­hydroxy­phenyl fragments is 53.9 (1)° and an intra­molecular O—H...O hydrogen bond occurs. In the crystal, O—H...O hydrogen bonds link the components into corrugated layers parallel to the ac plane. The short distance of 3.474 (5) Å between the centroids of the benzene rings in neighbouring santal mol­ecules reveals then existence of π–π inter­actions within the layers.