trans-1,4-CHD-(Cbz-L-Cys-OH)2

trans-1,4-CHD-(Cbz-L-Cys-Bt)2

trans-1,4-CHD-(Cbz-L-Cys-D-Pro-OH)2

trans-1,4-CHD-(Cbz-L-Cys-L-Pro-OH)2

Cbz-L-Glu-(Cbz-L-Cys-OH)-Cbz-L-Cys-OH