Patent ID: 7745441

Claim:
Purified urokinase inhibitors of general formula which are present as compounds in L-form, and wherein R 1 represents (a) a group of formula wherein either p=1 and r=2 and R 2 is benzyloxycarbonyl, benzylaminocarbonyl or 2-thienylhydrazinocarbonyl, or p=2 and r=1 and R 2 is ethoxycarbonyl, 2-propyloxycarbonyl, 2-propylaminocarbonyl, methylaminocarbonyl or methyl; or (b) a group of formula wherein R 3 is selected from the group consisting of methoxycarbonyl, ethoxycarbonyl, and benzyloxycarbonyl, and wherein the compounds occur in the form of their free bases or as salts with inorganic acids, or as salts with organic acids.