5,6,7,5 '-Tetramethoxy-3 ',4 '-Methylenedioxyflavone Monohydrate

title compound [ systematic name: 5,6,7-trimethoxy-2-(7-methoxy-1,3-dihydro-2-benzofuran-5-yl)-4H-chromen-4-one monohydrate], C20H18O8 center dot 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 center dot center dot center dot O hydrogen bonds. The dimers are further interconnected by a bridging water molecule via weak C-H center dot center dot center dot O-water and pairs of (O-H)(water)center dot center dot center dot O hydrogen bonds into a linear tape running parallel to the b axis.