Six new metabolites have been isolated from a lyngbyastatin 2-producing str
ain of the marine cyanobacterium Lyngbya majuscula collected at Apra Harbor
, Guam, and their structures elucidated. These linear lipopeptides have bee
n assigned the trivial names apramides A-F (1-6). From a more recent collec
tion of this cyanobacterium, a structurally related compound, apramide G (7
), has been found instead of apramides A-F (1-6). Structure elucidation of
the lipopeptides 1-7 is based on spectroscopic techniques and chiral chroma
tography of hydrolysis products. The apramides appear as NMR-spectroscopica
lly distinguishable conformers in solution, and this has been ascribed to t
he presence of a thiazole-containing modified amino acid unit.