Structures of Six Coleons (Diterpenoids) from Solenostemon monostachys (P. BEAUV.) BRIQ. (Labiatae) The above mentioned African labiate has been investigated for its leaf‐gland pigments. Besides the already known coleons C (1) and H (2), 2a‐formoxy‐coleon C (3), 12β‐O‐acetyl‐coleon Z (7), 12β‐O‐acetyl‐7‐O‐formyl‐7‐O‐desacetyl‐coleon Z (8) and a not separated mixture of 17‐acetoxy‐12β‐O‐acetyl‐coleon Z (9a) and 12β‐O‐acetyl‐17‐formoxy‐coleon Z (9b) have been isolated.
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Miyase et al. (1980) studied this question.
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