Liverworts are rich sources of both terpenoids and aromatic compounds. In the course of our systematic investigation of the chemical constituents of the liverworts, the minor components of Marchantia polymorpha (Zenigoke in Japanese) (3.5kg), collected in Duisburg (W. Germany), have been studied and several macrocyclic bis(bibenzyls) were isolated as a methyl ether or an acetate and the structures determined by extensive high resolution NMR spectroscopic methods. ^1H and ^<13>C NMR data were fully assigned by using 2D (C/H correlation and long-range C/H correlation) and LSPD techniques. Biological activities of these compounds are listed in the Tables 3 and 4.
