A lot of secondary metabolites such as depsides,depsidones,depsones and dibenzofuranes were produced by lichens,a class of unique organisms.

• 地衣是一类独特的生物有机体,其体内合成了多种特殊的次生代谢产物,主要为缩酚酸、缩酚酸环醚、缩酚酮、二苯并呋喃等类化合物。