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Spectroscopic data define the structures of three new antibiotics, 4',5'-dihydro-oligosporon (4), hydroxyoligosporon (5) and 10',11'-epoxyoligosporon (6) from the nematode-trapping fungus Arthrobotrys oligospora, and confirm the structures of the recently reported antibiotics oligosporon (1) and oligosporol B (3). The absolute configuration of the substituted 7-oxabicyclo[4.1.0]hept-3-ene nucleus of these metabolites is determined by circular dichroic spectroscopy. Oligosporon (1) and its dihydro-derivative (4) represent the second and most complex structural type of nematocidal metabolite to be characterised from cultures of nematophagous fungi.

Structures and Absolute Configurations of Antibiotics of the Oligosporon Group from the Nematode-trapping Fungus Arthrobotrys oligospora.