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Three novel diterpenoid alkaloids, comprising two C19–diterpenoid alkaloids (1 and 2) and one C20–diterpenoid alkaloid (3), were isolated from Delphinium ajacis, alongside the six known compounds (4–9). Their structures were elucidated by spectroscopic methods (MS, UV, IR, 1D and 2D NMR) and chemical properties. Simultaneously, the anti‐inflammatory properties of all compounds (1–9) was conducted,...