| a new depsidone and antibacterial activities of compounds from usnea undulata stirton. | usnea undulata stirton (usneaaceae) is a fruticose lichen used locally in ethnoveterinary medicine to treat mammary infections in cattle while human beings use it for the treatment of wounds in eastern cape, south africa. bioactivity-guided fractionation of its extracts led to the isolation and characterization of a new depsidone, 2'-o-methylhypostictic acid (8), together with seven known compounds, i.e. methyl β-orsellinate (1), norstictic acid (2), menegazziaic acid (3), (+) usnic acid (4), hy ... | 2011 | 22115039 |