Two metabolites, tentatively designated as PB-1 and PB-4, were isolated from moldy rice artificially inoculated with Pseudallescheria boydii IFM 4642. PB-1 was identified as pseurotin A (1) isolated from Pseudeurotium ovalis. The structure of PB-4 was determined to be (2) in Fig. 1. These metabolites exhibited inhibitory effect on the activity of monoamine oxidase (MAO).
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Maebayashi et al. (1985) studied this question.