Poisonous mushrooms. The deadly toxin orellanine is present in the toadstools Cortinarius orellanus and C. rubellus (see photo) as the water-soluble 4,4′-diglucoside. Its biosynthesis starts from anthranilic acid as has been shown by application of 15N/14N isotope ratio mass spectrometry.
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Spiteller et al. (2003) studied this question.
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