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Two varieties of Sideritis massoniana from Madeira (Madeira archipelago) and one from Fuerteventura (Canary Islands) have been examined. Diterpenes, triterpenes, sterols, flavonoids, coumarins and lignans have been isolated. A new coumarin, 7-demethyl-siderin acetate, and the uncommon sterol, 7-oxo-ss-sitosterol, have been obtained from S. massoniana var. crassifolia. From the chemosystematic point...
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