The compounds represented by formula (I) as inhibitors of type 5 phosphodiesterase or acceptable salts thereof and their use in the treatment and / or prevention of diseases or disease states related to type 5 phosphodiesterase in mammals are disclosed.公開了作爲5型磷酸二酯酶抑制劑的式(I)表示的化合物或其藥物可接受的鹽及其在治療和/或預防哺乳動物的與5型磷酸二酯酶相關的疾病或疾病狀態中的用途。