As expected both analogues were than 100 times more active than the inital I10G analogue. An additional I10G analogue, where the Pro-Arg motif from the Boc-Val-Pro-Arg-AMC substrate substituted residues Thr-4 and Lys-5, was also prepared but showed little advantage in terms of inhibitory also prepared but showed little advantage in terms of inhibitory activity relative to the native sequence