The present application describes 5-6 or 5-7 heterobicyclics of Formula I: ##STR1##

or pharmaceutically acceptable salt forms thereof, wherein ring P is a 5-membered heteroaromatic and ring M is a 6 or 7-membered non-aromatic carbocycle or heterocycle. Compounds of the present invention are useful as inhibitors of trypsin-like serine proteases, specifically factor Xa.