M. Tsuda et al., HYMENAMIDES C-E, NEW CYCLIC HEPTAPEPTIDES WITH 2 PROLINE RESIDUES FROM THE OKINAWAN MARINE SPONGE HYMENIACIDON SP, Tetrahedron, 49(31), 1993, pp. 6785-6796
Three new cyclic heptapeptides containing two proline residues, hymena
mides C - E (1 - 3), have been isolated from the Okinawan marine spong
e Hymeniacidon sp. and the structures elucidated on the basis of two d
imensional NMR data.