[N:1]([CH:4]1[CH2:9][CH2:8][N:7]([CH3:10])[CH2:6][CH2:5]1)=[C:2]=[S:3].[CH3:11][O:12][C:13]1[CH:14]=[C:15]([NH2:20])[C:16]([NH2:19])=[CH:17][CH:18]=1>O1CCCC1>[NH2:19][C:16]1[CH:17]=[CH:18][C:13]([O:12][CH3:11])=[CH:14][C:15]=1[NH:20][C:2]([NH:1][CH:4]1[CH2:9][CH2:8][N:7]([CH3:10])[CH2:6][CH2:5]1)=[S:3]A mixture of 37.5 parts of 4-isothiocyanato-1-methylpiperidine, 21.8 parts of 4-methoxy-1,2-benzenediamine and 270 parts of tetrahydrofuran was stirred and refluxed for 2 hours. The whole was evaporated, yielding 44 parts (100%) of N-(2-amino-5-methoxyphenyl)-N'-(1-methyl-4-piperidinyl)thiourea as a residue (interm. 26).
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