CRYSTAL POLYMORPH OF HYDROXYNOREPHEDRIN DERIVATIVE HYDROCHLORIDE

摘要

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.