[NH2:1][CH2:2][CH2:3][S:4][CH2:5][C:6]1[S:7][CH:8]=[CH:9][N:10]=1.CS[C:13](=[NH:18])[NH:14][N+:15]([O-:17])=[O:16]>>[N+:15]([NH:14][C:13]([NH:1][CH2:2][CH2:3][S:4][CH2:5][C:6]1[S:7][CH:8]=[CH:9][N:10]=1)=[NH:18])([O-:17])=[O:16]Reaction of 2-[(2-aminoethyl)thiomethyl]thiazole with S-methyl-N-nitroisothiourea by the procedure of Example 2(ii) gives N-nitro-N'-[2-(2-thiazolylmethylthio)-ethyl]guanidine.
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