The present application describes 6-5, 6—6, or 6-7 heterobicycles of Formula I or pharmaceutically acceptable salt forms thereof: ##STR1##

wherein ring P is a 6-membered heteroaromatic and ring M is a 5-, 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.