1: C5H10N2O2*2C9H14O4S; benzyl chloroformate With sodium hydroxide in 1,4-dioxane T=0 - 5°C; pH=10.5 - 11.0; 1.5 - 1.75 h; 2: With hydrogenchloride; water pH=4.0; 3: di-tert-butyl dicarbonate With hydrogenchloride; sodium hydroxide more than 3 stages;

hydrogen; palladium 10 on activated carbon in ethanol; water P=2844.39 Torr; 18 h;

caesium carbonate in N,N-dimethyl-formamide T=20°C; 3 h;

1: With 4-methyl-morpholine; isobutyl chloroformate in ethylene glycol dimethyl ether T=0°C; 0.333333 h; 2: With sodium tetrahydroborate in ethylene glycol dimethyl ether; water T=20°C;