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Scheme of the biosynthetic routes from GGPP to specialized and general diterpenoids of the abietane, labdane, and ent-kaurene class. Dashed arrows indicate reactions without experimental evidence in C. forskohlii. 1Detection of (+)-ferruginol in C. forskohlii was reported earlier (Hurley, 1998); 2CYP76AH1 from the close relative S. miltiorrhiza was proposed to convert miltiradiene to ferruginol (Guo et al., 2013).
