@article {4434, title = {Ambewelamides A and B, antineoplastic epidithiapiperazinediones isolated from the lichen Usnea sp}, journal = {Tetrahedron Letters}, volume = {39}, number = {52}, year = {1998}, note = {ISI Document Delivery No.: 148LLTimes Cited: 19Cited Reference Count: 15}, month = {Dec}, pages = {9579-9582}, type = {Article}, abstract = {Two potently cytotoxic epidithiapiperazinediones, ambewelamides A (1) and B (2), have been isolated from the lichen Usnea sp. collected in Sri Lanka. The structures were determined by a combination of X-ray crystallographic and spectroscopic analyses. (C) 1998 Elsevier Science Ltd. All rights reserved.}, keywords = {microtubules, TAXOL}, isbn = {0040-4039}, url = {://000077506700001}, author = {Williams, D. E. and Bombuwala, K. and Lobkovsky, E. and De Silva, E. D. and Karunaratne, V. and Allen, T. M. and Clardy, J. and Andersen, R. J.} }