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One new piperazinedione derivative, nigerpiperazine A ( 1 ), along with six known compounds ( 2–7 ) were isolated from the fungus  Aspergillus niger  JX-5 from mangrove  Ceriops tagal . Nigerpiperazine A ( 1 ) was elucidated by spectroscopic analyses and  13 C NMR chemical shift calculations, compounds  4  and  5  were determined by X-ray and the CD spectra. The absolute configuration of  4  was identified by X-ray for the first time. Compounds  1  and  4  showed inhibitory activities against  Helicoverpa armigera  Hubner with the IC 50  values of 200 and 100 µg/mL, respectively.

One new piperazinedione isolated from a mangrove-derived fungus Aspergillus niger JX-5