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Electronic paper This paper is published electronically. It meets the data-validation criteria for publication in Acta Crystallographica Section C. The submission has been checked by a Section C Co-editor though the text in the`Comments' section is the responsibility of the authors.

Troglitazone (or 5-{4-[(6-hydroxy-2,5,7,8-tetramethyl-chroman-2-yl) methoxy]benzyl}thiazolidine-2,4-dione, C24H27NO5S) is the first euglycemic drug. The molecules are held together in the lattice by intermolecular hydrogen bonds between the hydroxy O atom of the chroman moiety, and the ketone O and ring N atom of the thiazolidine-2,4-dione moiety.

Key indicatorsSingle-crystal X-ray study T = 298 K Mean '(C±C) = 0.005 A Ê R factor = 0.060 wR factor = 0.060 Data-to-parameter ratio = 10.9For details of how these key indicators were automatically derived from the article, see