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A chemical investigation of  Aspergillus californicus  IBT 16748 led to the isolation of two new oxepine-pyrimidinone-ketopiperazine type nonribosomal peptides oxepinamides L ( 1 ) and M ( 2 ). Their structures were characterised by spectroscopic analysis including HRESIMS, 1D and 2D NMR. The absolute structure of  1  was assigned by ECD calculation. The antibacterial and cytotoxic properties of  1  were evaluated.

Oxepinamides L and M, two new oxepine-pyrimidinone-ketopiperazine type nonribosomal peptides from Aspergillus californicus