SOLIFENACIN-CONTAINING COMPOSITION

摘要

A novel process for producing a composition containing either solifenacin or a salt thereof; and a composition containing either solifenacin or a salt thereof obtained by the production process, which contains a solifenacin compound having an optionally substituted lower alkyl bonded to the 2-position of the quinuclidine. The composition contains solifenacin in a high purity, and contains, only in an extremely small amount, unexpected compounds which are peculiar to the production process. It hence has extremely preferable properties required of ingredients for medicines.