Fatty acids and cyclic bis(bibenzyls) from the New Zealand liverwort Monoclea forsteri

Abstract

Two novel fatty acids named monocleic and monocleolic acids and two new cyclic bis(bibenzyls) riccardins D and C were isolated from the New Zealand large thalloid liverwort Monoclea forsteri together with the previously known bis(bibenzyls) riccardin C and perrottetin E. The structures of the new fatty acids were established to be 10-keto-octadec-6-yn-8(E)-enoic acid and 10-hydroxy-octadec-6-yn-8(E)-enoic acid by the chemical and 1H and 13CNMR spectral data. The structures of the new bis(bibenzyls) were also determined by the extensive 2D COSY NMR and different NOE spectroscopy. The present species is chemically different from members of the Metzgeriales and the Marchantiales.