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The 13C n.m.r, spectrum of austin has been fully assigned by inter alia analysis of long range 1H–13C couplings in the fully 1H-coupled 13C n.m.r. spectrum. Further related metabolites, dehydroaustin, austinol, and isoaustin, have been isolated from Aspergillus ustus, Aspergillus variecolor, and Penicillium diversum. Their structures have been assigned by detailed analysis of their 1H and 13C n.m.r. spectra.
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Simpson et al. (1982) studied this question.
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