Abstract
A mixture of nazumazoles A-C (1-3) was purified from the extract of the marine sponge Theonella swinhoei. The mixture was eluted as an extraordinarily broad peak in the reversed-phase HPLC. The structures of nazumazoles were determined by interpretation of the NMR data and chemical degradations. Nazumazoles contain one residue each of alanine-derived oxazole and α-keto-β-amino acid residue. Nazumazoles exhibited cytotoxicity against P388 cells.
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