Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
To provide novel crystals useful as an ingredient for the production of a diabetes remedy. The invention is concerned with α-form crystal and β-form crystal of (R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenyleth-yl)amino]ethyl]acetanilide. The α-form crystal does not exhibit hygroscopicity and has stability such that it can be used as a medicine, and is useful for mass synthesis in the industrial production. The β-form crystal does not relatively exhibit hygroscopicity and is also useful as a production intermediate of the α-form crystal.
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Rouhi, Chemical and Engineering News, Feb. 24, 2003, pp. 32-35, especially p. 32.
International Search Report for PCT/JP02/11217, Jan. 28, 2003.
Astellas Pharma Inc.
Finnegan Henderson Farabow Garrett & Dunner LLP
Stockton Laura L.
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