| 摘要 |
This invention provides a process for the preparation of a compound of formula (I), wherein R1 and R2 are each, independently, hydrogen, alkyl, alkoxy, trifluoromethyl, trifluoromethoxy, methanesulfonylamino, acetylamino, halo, cyano, nitro, or when taken together R1 and R2 represent a methylenedioxy or ethylenedioxy moiety; or a pharmaceutically acceptable salt thereof.
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