%0 Journal Article %T 4′,5-Dihydroxy-7-methoxyflavanone dihydrate %A Ivá %A n Brito %A Jorge Bó %A rquez %A Mario Simirgiotis %A Alejandro Cá %A rdenas %J Acta Crystallographica Section E %D 2012 %I International Union of Crystallography %R 10.1107/s1600536811051221 %X The title compound, C16H14O5¡¤2H2O [systematic name: 5-hydroxy-2-(4-hydroxyphenyl)-7-methoxychroman-4-one dihydrate], is a natural phytoalexin flavone isolated from the native chilean species Heliotropium taltalense and crystallizes with an organic molecule and two water molecules in the asymmetric unit. The 5-hydroxy group forms a strong intramolecular hydrogen bond with the carbonyl group, resulting in a six-membered ring. In the crystal, the components are linked by O¡ªH...O hydrogen bonds, forming a three-dimensional network. The 4-hydroxyphenyl benzene ring is bonded equatorially to the pyrone ring, which adopts a slightly distorted sofa conformation. The title compound is the hydrated form of a previously reported structure [Shoja (1990). Acta Cryst. C46, 1969¨C1971]. There are only slight variations in the molecular geometry between the two compounds. %U http://scripts.iucr.org/cgi-bin/paper?S1600536811051221