[CH3:1][N:2]([CH3:13])[C:3]([NH:5][C:6]1[CH:11]=[CH:10][CH:9]=[C:8]([OH:12])[CH:7]=1)=[S:4].C(OCC)(=O)C.[CH3:20][N:21]=[C:22]=[O:23]>CCCCCC>[CH3:1][N:2]([CH3:13])[C:3]([NH:5][C:6]1[CH:11]=[CH:10][CH:9]=[C:8]([O:12][C:22](=[O:23])[NH:21][CH3:20])[CH:7]=1)=[S:4]1,1-dimethyl-3-(meta-methylcarbamoyloxyphenyl)-2-thiourea is prepared by charging to a suitable equipped reaction vessel about 32.7 parts by weight of 1,1-dimethyl-3-(meta-hydroxyphenyl)-2-thiourea, about 100 parts by weight of ethyl acetate, about 12 parts by weight of methyl isocyanate and about 1 part by weight triethylamino, refluxing for about 1 hour with stirring, diluting the resulting slurry with about 100 parts by weight of hexane, cooling to about 20°C., recovering the precipitate from the remainder by filtration, washing the recovered solid with ethyl acetate and hexane and air drying.
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