@article {6485, title = {ANTHOSTERONE-A AND ANTHOSTERONE-B, RING-A CONTRACTED STEROIDS FROM THE SPONGE ANTHORACUATA-GRACEAE}, journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie}, volume = {66}, number = {5}, year = {1988}, note = {ISI Document Delivery No.: P1056Times Cited: 22Cited Reference Count: 23}, month = {May}, pages = {1173-1178}, type = {Article}, isbn = {0008-4042}, url = {://A1988P105600023}, author = {Tischler, M. and Ayer, S. W. and Andersen, R. J. and Mitchell, J. F. and Clardy, J.} }