| abstract |
To provide novel crystals useful as an ingredient fornthe production of a diabetes remedy. The invention isnconcerned with α-form crystal and β-form crystal ofn( R )-2-(2-aminothiazol-4-yl)-4'-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetanilide.nThe α-form crystal does notnexhibit hygroscopicity and has stability such that it can benused as a medicine, and is useful for mass synthesis in thenindustrial production. The β-form crystal does not relativelynexhibit hygroscopicity and is also useful as a productionnintermediate of the α-form crystal. |