| 摘要 |
A process for producing a crystal of an azetidinone derivative comprising subjecting an azetidinone derivative to crystallization using an organic solvent to yield the azetidinone derivative in the form of a crystal; and a crystal of the azetidinone compound. The process can provide an azetidinone compound which is useful as an intermediate for the synthesis of a 1ß-methylcarbapenem compound for oral administration, in the form of a crystal which is high in purity and is easy to handle. |
