5,6,7,5′-Tetra­meth­oxy-3′,4′-methyl­ene­dioxy­flavone monohydrate

The title compound [systematic name: 5,6,7-trimeth­oxy-2-(7-meth­oxy-1,3-dihydro-2-benzofuran-5-yl)-4H-chromen-4-one monohydrate], C₂₀H₁₈O₈·H₂O, was isolated from the popular Chinese medicinal plant Entada phaseoloides. In the crystal, inversion-related mol­ecules are joined by pairs of weak C—H...O hydrogen bonds. The dimers are further inter­connected by a bridging water mol­ecule via weak C—H...O_water and pairs of (O—H)_water...O hydrogen bonds into a linear tape running parallel to the b axis.