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Horminone, taxoquinone and other royleanones, obtained from two Abyssinian Plectranthus species (Labiatae). From the coloured glands on the leaves of two botanically unclassified Plectranthus sp. from Abyssinia, a series of royleanones has been isolated, namely royleanone (1) and 6,7‐dehydroroyleanone (2) from one species, and 6,7‐dehydroroyleanone, horminone (3), taxoquinone (4), 6β, 7α‐dihydroxyroyleanone (5), 7α‐acetoxy‐6β‐hydroxyroyleanone (6) and 7‐oxoroyleanone (7) respectively, from the other.
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Hensch et al. (1975) studied this question.
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