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The ent-kaurane diterpenoids belong to an increasing family of natural products that contain over 1500 members.Most of them share the basic structure of ent-kaurane with diverse patterns of oxygenation,while a few possess quite different structures that might be generated from C-C bond cleavages or fragmentations of ent-kaurane precursors,which can be classified as rearranged ent-kaurane diterpenoids.