Seventeen new compounds of 4-(4-guanidinobenzoyloxy) benzamides and 4-(4- guanidinobenzoyloxy) benzoyloxyacetamides were prepared and their inhibitory activities on trypsin, thrombin and porcine pancreatic elastase were measured. These compounds were found to be selective trypsin inhibitors with inhibiting activities from 0.44 to 43 μM.
