Structure determination of two extractives from Aspergillus amstelodami by nuclear magnetic resonance spectroscopy

Spectral evidence supports the assignment of structures (1) and (2) to two substances extracted from the mycelium of Aspergillus amstelodami; they can be obtained by thermal condensation of auroglaucine with neoechinuline B and neoechinuline C, respectively, which are all known metabolites of the fungus.