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.
本发明提供了一种(-)-2-[4-[2-[[1S,2R]-2-羟基-2-(
4-羟基苯基)-1-甲基乙基]
氨基]乙基]-2,5-二甲基
苯氧乙酸乙酯盐酸盐的新型晶体多晶型,该晶体多晶型可通过粉末 X 射线衍射的特征衍射峰等确定、(-)-2 -[4-[2-[[1S,2R]-2-羟基-2-(
4-羟基苯基)-1-甲基乙基]
氨基]乙基]-2,5-二甲基
苯氧乙酸乙酯通过特定方法制得。