PROCESS FOR PREPARING PROTEASE INHIBITORS

摘要

An acidic protease inhibitor obtained by allowing a compound of +TR wherein X and Y are L-leucine or L-valine, or its salt, to react with an aluminum compound in a medium containing water and/or an alcohol, and further continuing the reaction after adjusting the pH of the system within a range of 4.5 to 7. The protease can stay long in stomach, have an action to protect ulcerated areas and retain the antiulcer effect for a long period of time.