title: Vadimezan: 2-(5,6-dimethyl-9-oxo-9H-xanthen-4-yl)acetic acid.
abstract: In the title mol-ecule, C(17)H(14)O(4), the C atom of the carboxyl group deviates by 1.221 (3) Å from the plane [maximum deviation = 0.0122(2) Å] of the tricycic ring system. In the crystal structure, inter-molecular O-H⋯O hydrogen bonds link the mol-ecules into centrosymmetric dimers, and π-π inter-actions [centroid-centroid distances = 3.491 (3), 3.591 (3), 3.639 (3) and 3.735 (3) Å] link these dimers into layers parallel to the ac plane. Weak inter-molecular C-H⋯O inter-actions further consolidate the crystal packing.
authors: College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310032, People's Republic of China.
authors: Shi-Jie
authors: SJ
authors: Zhang
authors: Wei-Xiao
authors: WX
authors: Hu
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