1931 8 390 Curtius..assigned to this material the structure of a cyclic octapeptide, but a much more highly polymeric open chain structure seems more probable.
1972 17 June 1320/1 The superb work of Wieland and his school established that the toxins are either cyclic heptapeptides or octapeptides.
1990 18 261/2 An octapeptide sequence, which was later shown to map near the carboxy terminus, was obtained from a tryptic fragment.