Novel chemotaxonomic markers of the Alternaria infectoria species-group. 
Two new structurally related metabolites, novae-zelandin A (1) and novae-zelandin B (2), as well as the novel metabolite 4Z-infectopyrone (3) were purified from extracts of filamentous fungi belonging to the Alternaria infectoria species-group.  The structures were elucidated by a combination of 1D and 2D NMR spectroscopic data and MS data.  1-3 are important chemotaxonomic markers of the A. infectoria species-group and exhibit structures similar to those of known biologically active compounds, suggesting that they could be potential phytotoxins.