[CH3:1][N:2]=[C:3]([NH2:18])[NH:4][C:5]1[CH:9]=[N:8][N:7]([CH2:10][CH2:11][CH2:12][CH2:13][C:14](=[NH:17])OC)[N:6]=1.[C:19]([NH:22][NH2:23])(=[O:21])[CH3:20]>CO>[C:19]([NH:22][NH:23][C:14](=[NH:17])[CH2:13][CH2:12][CH2:11][CH2:10][N:7]1[N:6]=[C:5]([NH:4][C:3]([NH2:18])=[N:2][CH3:1])[CH:9]=[N:8]1)(=[O:21])[CH3:20]Methyl 5-[4-[2-methylguanidino)-1,2,3-triazol2-yl]valerimidate (1.0 g.) in MeOH (12 ml.) was treated with acethydrazide (0.22 g.) and the solution stirred for 18 nours. Evaporation of the solvent and trituration of the resioue with ether/EtOH gave N-acetylamino-5[4-(2-methylguanidino)-1,2,3-triazol-2-yl]valeramidine as a yellow sticky solid [0.54 g.) which was used without further purification.
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