The new pentacyclic guanidine alkaloids, monanchoxymycalin A (1) and monanchoxymycalin B (2) were isolated from the Far-Eastern marine sponge Monanchora pulchra. Their structures were assigned on the basis of detailed analysis of 1D- and 2D-NMR spectroscopic and mass spectrometric data. Compounds 1 and 2 exhibited potent cytotoxic activities against cervical epithelioid carcinoma HeLa cells and breast adenocarcinoma MDA-MB231 cells.
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