Acta Cryst. (2005). E61, o3234-o3236  [ doi:10.1107/S1600536805028291 ]

A second monoclinic polymorph of 1-(2,4-dihydroxy-6-methoxyphenyl)-3-(4-methoxyphenyl)propan-1-one

S.-L. Ng, I. A. Razak, H.-K. Fun, S. Boonsri, S. Chantrapromma and U. Prawat

Abstract: The title compound, C₁₇H₁₈O₅, was isolated from the leaves of Rauwenhoffia siamensis Scheff. There are two crystallographically independent molecules in the asymmetric unit. The dihedral angle between the two benzene rings is 80.81 (7)° in one molecule and 65.89 (7)° in the other. The symmetry-related molecules are linked via O-HO intermolecular hydrogen bonds to form chains along [201].

Online 14 September 2005

Copyright © International Union of Crystallography
IUCr Webmaster