A third naphthaquinone pigment isolated from Torula herbarin is now identified as O-methylherbarin by IR, NMR and mass spectroscopic methods. The structure is confirmed by partial synthesis by methylation of herbarin using methyl iodide and silver oxide. The gas chromatographic-mass spectrometric characteristics of herbarin, dehydroherbarin and O-methylherbarin are described.
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Narasimhachari et al. (1974) studied this question.
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