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The metabolism of iridals, unusual triterpenoids found in sword lilies, was studied in a cell culture of Iris pseudacorus Linn. The cells contain mainly spiroiridals, esterified with capric acid, which are hydrolyzed by esterases upon cell disruption. In ether extracts of these cell homogenates 10-desoxyiridal, a hitherto unknown precursor of the iridals, was identified by comparison with a semisynthetic...
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