Nitric oxide-independent activator of soluble guanylyl cyclase (sGC). Significantly elevates cGMP levels and inhibits collagen-stimulated aggregation of washed rabbit platelets (IC50 = 14.6 μM); induces relaxation in denuded phenylephrine-contracted rabbit aortic rings (EC50 = 1.9 μM). Also displays antiproliferative activity in vitro and in vivo by inducing G1 cell cycle arrest in two human hepatocellular carcinoma (HCC) cell lines, and in HCC xenografts in athymic SCID mice. Exhibits low cytotoxicity in non-malignant cells. Purity 99%. MW (observed): 304.34