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Thermodynamic stability and crystal structures for polymorphs and solvates of formoterol fumarate

Polymorph screening of formoterol fumarate was performed in 12 solvents, followed by evaluations of thermodynamic stability. Three anhydrates, a dihydrate, a diethanolate, a diisopropanolate, and a dibensylalcoholate were found. The crystal structure of three solvated modifications and of the most stable anhydrate was investigated. This indicated that solvation is needed to get a stable and well packed crystal structure. Thermodynamic testing suggests that five crystal modifications are thermodynamically stable, at different conditions, since they are all reversibly related to each other. © 2006 Wiley‐Liss, Inc. and the American Pharmacists Association J Pharm Sci 95:1144–1161, 2006 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Pharmaceutical Science Wiley

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