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Generated: June 29, 2017

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Claims for Patent: 6,268,489

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Claims for Patent: 6,268,489

Title: Azithromycin dihydrate
Abstract:Non-hygroscopic, azithromycin (9-deoxo-9a-aza-9a-methyl-9a-homoerythromycin) dihydrate and a process therefor.
Inventor(s): Allen; Douglas J. M. (New London, CT), Nepveux; Kevin M. (Old Saybrook, CT)
Assignee: Pfizer Inc. (New York, NY)
Application Number:07/994,040
Patent Claims: 1. Crystalline azithromycin dihydrate.

2. A method of preparing crystalline azithromycin dihydrate which comprises crystallization of amorphous azithromycin or azithromycin monohydrate from a mixture of tetrahydrofuran and a (C.sub.5 -C.sub.7) aliphatic hydrocarbon in the presence of at least 2 molar equivalents of water.

3. A method of claim 2 wherein the hydrocarbon is hexane.
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