Microbiaeratin, a new natural indole alkaloid from a Microbispora aerata strain, isolated from Livingston Island, Antarctica.

Abstract A new sulphur‐containing natural alkaloid named microbiaeratin (1a) was isolated, together with the known microbiaeratinin (2, bacillamide) from the culture filtrate of Microbispora aerata strain IMBAS‐11A. The organism was isolated from penguin excrements collected on the Antarctic Livingston Island. The structure was elucidated by one‐ and two‐dimensional NMR experiments and mass spectrometric investigations.