SSAO inhibitor-2 (Compound 1) is a semicarbazide-sensitive amine oxidase ( SSAO ) inhibitor with IC 50 s of <10 nM, and 10-100 μM for human SSAO and MAO-A , respectively. SSAO inhibitor-3 can be used for the research of atherosclerosis, diabetes and its complications, obesity, stroke, chronic kidney disease, retinopathy, chronic obstructive pulmonary disease (COPD), autoimmune diseases, multiple sclerosis, etc.