GW274150 phosphate is a potent, selective, orally active and NADPH-dependent inhibitor of human inducible nitric oxide synthase (iNOS) (IC50=2.19 μM; Kd=40 nM) and rat iNOS (ED50=1.15 μM) . GW274150 phosphate displays less potency for both humans or rats endothelial NOS (eNOS) and neuronal NOS (nNOS) . GW274150 phosphate exerts a protective role in an acute model of lung injury inflammation[1][2].