Crystal polymorph of hydroxynorephedrin derivative hydrochloride
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United States of America Patent
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Jul 27, 2010
Grant Date -
Mar 12, 2009
app pub date -
Apr 24, 2006
filing date -
Apr 26, 2005
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Abstract
The present invention provides a novel crystal polymorph of ethyl (−)-2-[4-[2-[[1S,2R]-2-hydroxy-2-(4-hydroxyphenyl)-1-methylethyl]amino]ethyl]-2,5-dimethylphenoxyacetate hydrochloride which can be determined by characteristic diffraction peaks of the powder X-ray diffraction or the like, and obtained from ethyl (−)-2-[4-[2-[[1S,2R]-2-hydroxy-2-(4-hydroxyphenyl)-1-methylethyl]amino]ethyl]-2,5-dimethylphenoxyacetate by a specific method.
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