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Bioactive abietane diterpenes: Royleanone (1); 7α-acetoxyroyleanone (2); 7-ketoroyleanone (3); Sugiol (4); Horminone (5); 7α,6β-dihydroxyroyleanone (6); 7α-formyloxy-6β-hydroxyroyleanone (7); 7α-acetoxy-6β-hydroxyroyleanone (8); Coleon U (9); 6,7-dehydroroyleanone (10).
