In addition to (–)-sclerotiorin, Penicillium hirayamae Udagawa elaborates a laevoratory, red pigment, rubrorotiorin, C23H23ClO5, which has been identified as 7-epi-5-chloroisorotiorin by degradation and by synthesis. Rubrorotiorin is the first naturally occurring angular member of the sclerotiorin (azaphilone) group of fungal metabolites to be characterised.
R. W. Gray and W. B. Whalley, J. Chem. Soc. C, 1971, 3575 DOI: 10.1039/J39710003575
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