| 摘要 |
To provide a novel method for producing a composition comprising solifenacin or a salt thereof, and a composition comprising solifenacin or a salt thereof as produced by the method, wherein an optionally substituted lower alkyl is added to the 2-position of the quinuclidine of solifenacin. The composition of the present invention contains a highly pure solifenacin, while the unexpected compounds specific to the method in an extremely low content, so that it has very preferable properties as a bulk for pharmaceutical products.
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