1: phenylacetic acid With 4-(N,N-dimethlyamino)pyridine; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride in DMF (N,N-dimethyl-formamide) T=0 - 4°C; 0.5 h; 2: 5,6-diamino-1-[2-(4-nitrophenyl)ethyl]-3-propyluracil in DMF (N,N-dimethyl-formamide) T=20°C; 60 h;