本發明係關於一種新穎二苯並[f,h]異喹啉衍生物,亦關於一種使用此類化合物治療關於一氧化氮過度產生、癌症或病毒感染之疾病之方法。A group of novel dibenzo[f,h]isoquinoline derivatives as shown in the specification. Also disclosed are methods of using the compounds for treating a disease associated with NO overproduction, cancer, or viral infection.