Collatolic acid derivatives from lichen Parmotrema planatilobatum (Hale) Hale (Parmeliaceae)

Abstract

Continuation of the phytochemical analysis of the lichen Parmotrema planatilobatum (Hale) Hale resulted in the isolation of six compounds. On the basis of spectroscopic evidences (NMR, MS), the structures were established as 8-[2,4-dihydroxy-6-(2-oxoheptyl)phenoxy]-6-hydroxy-3-pentyl-1H-isochromen-1-one (1), 8-[2,4-dihydroxy-6-(2-oxoheptyl)phenoxy]-6-methoxy-3-pentyl-1H-isochromen-1-one (2), β-collatolic acid (3), lichesterinic acid (4), D-arabinitol (5), D-mannitol (6). This is the first time these compounds are reported in Parmotrema planatilobatum (Hale) Hale.