sGC stimulator 1 is a carbonyl sulfide (COS)/H2S-donor hybrid soluble guanylyl cyclase (sGC) stimulator (EC50 = 496 nM). sGC stimulator 1 exhibits a well-characterized H2S-releasing property. sGC stimulator 1 reduces fibrosis in TGF-beta1-treated cardiac fibroblasts by increasing cGMP and H2S levels. sGC stimulator 1 can exert anti-fibrotic effects by activating sGC and increasing H2S. sGC stimulator 1 can be used for the study of heart failure (HF)[1].