Ambewelamides A and B, antineoplastic epidithiapiperazinediones isolated from the lichen Usnea sp. - Williams, D.E.; Bombuwala, K.; Lobkovsky, E.; De Silva, E.D.; Karunaratne, V.; Allen, T.M.; Clardy, J.; Andersen, R.J. (My University, 1998)
Keywords: Biochemistry; Lichens; Cytotoxicity; Usnea sp.; Natural products