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A. Selected examples of oxidized ent-kauranes, ent-atisanes and ent-trachylobanes. B. Limitations of purely chemical C–H oxidation approaches in steviol-based semisynthesis. C. Retrosynthetic analysis of oxidized ent-kauranes, ent-atisanes and ent-trachylobanes employing a hybrid oxidative approach that combines chemical and enzymatic C–H oxidations. Glc = β-D-glucopyranosyl.
