From the seeds of Annona glabla two new cyclopeptides, glabrin A [cycl
o-(prolyl-glycyl-lencyl-valyl-is olencyl-tyrosyl)] and B [cyclo- ometh
yl-valyl-alanyl-valyl-tyrosyl-glycyl-thryl)], have been isolated. Thei
r structures were elucidated by chemical and spectral methods. (C) 199
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