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Two new spiro-heterocyclic γ -lactam derivatives, cephalimysins M ( 1 ) and N ( 2 ), were isolated from the fermentation cultures of the marine-derived fungus Aspergillus fumigatus CUGBMF17018. Two known analogues, pseurotin A ( 3 ) and FD-838 ( 4 ), as well as four previously reported helvolic acid derivatives, 16- O -propionyl-16- O -deacetylhelvolic acid ( 5 ), 6- O -propionyl-6- O -deacetylhelvolic acid ( 6 ), helvolic acid ( 7 ), and 1,2-dihydrohelvolic acid ( 8 ) were also identified. One-dimensional (1D), two-dimensional (2D) NMR, HRMS, and circular dichroism spectral analysis characterized the structures of the isolated compounds.

Two New Spiro-Heterocyclic γ-Lactams from A Marine-Derived Aspergillus fumigatus Strain CUGBMF170049