The crystal structure of the monoclinic form of 7-hydroxy -2 -(2,3,4 -trimethoxyphenyl )-4H-1 -benzopyran-4-0ne, C18H1606, contains two molecules in the asymmetric unit which differ from each other in both the torsion angle between the 7-benzopyrone portion and the trimethoxylated phenyl ring, and the orientation of the out-of-plane methoxy groups. The torsion angle values are different from those of the previous form [Llorca, Molins, Miravitlles, Cody, Wallet & Gaydou (1993). J. Crystallogr. Spectrosc. Res. 23,[481][482][483][484] and are indicative of a large degree of 'floppiness' in the trirnethoxylated phenyl ring.

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