Abstract
Three unprecedented dimeric clerodane diterpenoids, dodovisdimers A−C (1–3), along with six known clerodane monomers (4–9), were isolated from Dodonaea viscosa. Compounds 1–3 may be biosynthetically formed via an intermolecular Diels-Alder [4+2] cycloaddition between the coexisting monomers 4–7. The structures of these clerodanes were characterized by spectroscopic techniques, X-ray crystallographic study, and ECD calculations. Some isolates exerted antiviral effects on human influenza A virus (H3N2) in vitro.
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