Ataciguat induces the relaxation in aortic rings or coronary rings. In the presence of nitric oxide synthase (NOS) inhibitor, the endothelium effect was abolished to DETA-NO or ataciguat, in both vessels. Ataciguat was able to induce NO production in HUVECs cells. In the presence of NOS inhibitor, the NO production induced by ataciguat was abolished[1].