Praesalide E, a new phenolic compound from the lichen Parmotrema praesorediosum (nyl.) Hale

The crude extract was obtained by the maceration method of dried power of Parmotrema praesorediosum lichen in methanol. This extract was then separated by the solid-phase extraction and eluted with petroleum ether, chloroform, ethyl acetate, acetone, and methanol in turn to give the corresponding extracts. Two compounds were isolated from chloroform extract by silica gel column chromatography.