Abstract
Six new diterpenoids containing a novel fused 3,6,6,5-tetracyclic ring system, verrucosane, were isolated from the liverwort Mylia verrucosa Lindb., and the structures and absolute configurations were determined as (–)-2β,9α-dihydroxyverrucosane (1), (–)-9α-acetoxy-2β-hydroxyverrucosane (2), (–)-2β-hydroxy-9-oxoverrucosane (3), (–)-2β-acetoxy-11α-hydroxyverrucosane (17), (–)-11α-acetoxy-2β-hydroxyverrucosane (24), and (–)-2β-hydroxyverrucosane (26) on the basis of chemical and spectral evidence.

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