[CH3:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][CH2:9][N:10]([C:13]2[CH:18]=[CH:17][C:16]([CH3:19])=[CH:15][CH:14]=2)[N:11]=O)=[CH:4][N:3]=1.S([O-])([O-])(=O)=S.[Na+].[Na+]>>[CH3:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][CH2:9][N:10]([C:13]2[CH:14]=[CH:15][C:16]([CH3:19])=[CH:17][CH:18]=2)[NH2:11])=[CH:4][N:3]=1reacting 2-methyl-5-(N-nitroso-2-p-tolylaminoethyl)pyridine with sodium thiosulfate to obtain 2-methyl-5-(N-amino-2-p-tolylaminoethyl)pyridine;
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