1 0Z3 6-ammonio-N-(trifluoroacetyl)-L-norleucyl-N-[4-(1-methylethyl)phenyl]-L-phenylalaninamide 1.000 2 0Z4 6-ammonio-N-(trifluoroacetyl)-L-norleucyl-N-[4-(1-methylethyl)phenyl]-L-leucinamide 0.769 3 2Z5 6-ammonio-N-(trifluoroacetyl)-L-norleucyl-N-[4-(trifluoromethyl)phenyl]-L-alaninamide 0.718