METHOD FOR MANUFACTURING CRYSTALLINE FORM (I) OF CLOPIDOGREL HYDROGEN SULPHATE

摘要

The present invention provides a method for manufacturing a crystalline form (I) of clopidogrel hydrogen sulphate(clopidogrel hydrogen sulfate), including reacting a clopidogrel free base with concentrated sulfuric acid in the presence of a mixed solvent containing water in an amount of 4 to 14% by weight based on the weight of the clopidogrel free base and 2-butanol.