Journal
TETRAHEDRON
Volume 61, Issue 3, Pages 575-583Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2004.11.016
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Three new modified peptides banyasin A, banyaside A and banyaside B were isolated from the hydrophilic extract of a natural bloom of the cyanobacteriurn Nostoc sp. The planar structure of the new compounds was determined by homonuclear and inverse-heteronuclear 2D NMR techniques as well as high-resolution mass spectrometry. Banyasides A and B, are structurally closely related to the cyanobacteria metabolite, suomlide and to the sponge derived, dysinosins. The absolute configuration of the asymmetric centers was studied using Marfey's method for HPLC. Banyaside A and B were found to be trypsin and thrombin inhibitors. (C) 2004 Elsevier Ltd. All rights reserved.
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