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A new bisuracil analogue, 3,3-bis(uracil-1-yl)-propan-1-aminium (1), together with four known N-containing metabolites (2–5), were isolated from the South China Sea sponge Agelas clathrodes. Their chemical structures were established on the basis of spectroscopic and spectrometric analysis and comparison with known compounds. Compound 1 is an unusual naturally occurring bisuracil analogue, and compound 2 was isolated from a natural source for the first time. Compounds 2 and 4 exhibit moderate cytotoxicity against cancer cell line SGC7901.

N-Containing Metabolites from the Marine Sponge Agelas clathrodes