Cyclolinopeptides F-I, cyclic peptides from linseed

Four cyclic peptides, cyclolinopeptides F-I, were isolated from seeds of Linum usitatissiman. Their structures were elucidated by extensive 2D NMR spectroscopic methods and by chemical degradation. Further, their immunosuppressive activity is examined. (C) 2001 Elsevier Science Ltd. All rights reserved.