Alkaloids and citrinins from marine-derived fungus Nigrospora oryzae SCSGAF 0111

A new pyrrolidinone, nigrospine (1), a new indole alkaloid, nigrospin A (2) and two new citrinins, nigrospins B and C (3-4) were isolated from a culture broth of the marine-derived fungal strain Nigrospora oryzae SCSGAF 0111. Their structures were determined by spectroscopic analysis, and the absolute configurations of 1 and 2 were determined by the Mosher ester technique. Compound 1 contains a rare 2,3-dihydro-benzofuran[2,3-c]2-pyrrolidone skeleton.