1: anhydrous L-lysine monohydrochloride; N-Boc-1H-benzotriazole With sodium hydroxide in tetrahydrofuran; water T=0°C; pH=11.5; 2: benzyl chloroformate in tetrahydrofuran; water pH=10 - 11; 3: With hydrogenchloride in isopropanol acetate; water pH=2;