1: Ddz-D-Ala-OH With 4-methyl-morpholine; isobutyl chloroformate in dichloromethane T=-20°C; 1 h; Inert atmosphere; 2: 2-(2-bromo-3,5-dinitrophenyl)ethanamine hydrochloride With triethylamine in dichloromethane; N,N-dimethyl-formamide T=20°C; Inert atmosphere;