Studies on Detoxin complex, the selective antagonists of Blasticidin S. The structures of minor congeners of the detoxin complex.

The structures of minor congeners of the detoxin complex, viz., detoxins E1, C1, C2, C3, B1, B3 and A1, have been established on the basis of degradative and spectroscopic evidences. It is of interest that the detoxin B group contains 5-deoxydetoxinine in place of detoxinine, and that a change of the terminal amino acid residue from L-valine to L-isoleucine was first recognized in detoxin E1. The structure-activity relationship of the detoxin compounds is discussed with comparison of their antagonistic activities against blasticidin S.