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Pyrrolo[4,3,2-de]quinoline core is a characteristic substructure found in a number of natural products which often exhibit a wide range of biological activities.[1] For example,an array of newly discovered marine alkaloids ammosamides[2] with such fused cyclic skeleton possess attractive bioactivities including significant cytotoxicity against human HCT-116 colon carcinoma and moderate inhibitory potency against human quinone reductase.