A neutral inhibitor of the serine protease factor Xa was identified via a h
igh throughput screen of a commercial library. The initial lead 1 demonstra
ted reversible and competitive inhibition kinetics for factor Xa and posses
sed a high degree of selectivity versus other related serine proteases. Ini
tial modeling efforts and the generation of a series of analogues of 1 are
described. (C) 2001 Elsevier Science Ltd. All rights reserved.