De. Williams et al., FERINTOIC ACID-A AND ACID-B, NEW CYCLIC HEXAPEPTIDES FROM THE FRESH-WATER CYANOBACTERIUM MICROCYSTIS-AERUGINOSA, Journal of natural products, 59(6), 1996, pp. 570-575
The cyclic hexapeptides ferintoic acids A (1) and B (2) have been isol
ated from cells of Microcystis aeruginosa harvested during a natural b
loom of the toxic cyanobacterium. The structures of 1 and 2 were deter
mined by a combination of spectroscopic analysis and chemical degradat
ion.