13-Epi-neo- and 13-epi-homoverrucosane diterpenoids from the liverwort Schistochila nobilis

13-epi-Homoverrucosan-5β-ol, a novel diterpene alcohol with a 7,6,5-fused carbon skeleton, was isolated from the New Zealand liverwort, Schistochila nobilis, together with the previously known 13-epi-neoverrucosan-5β-ol and the sesquiterpene hydrocarbon, gymnomitrene (= β-barbatene). The stereostructure of the new diterpenoid was elucidated by NMR spectra and chemical transformation of 13-epi-neoverrucosan-5β-ol by dilute acid.