[CH3:1][O:2][CH:3]([O:7][CH3:8])[CH2:4][NH:5][CH3:6].C1C=CC=CC=1.[Cl:15][C:16]1[CH:17]=[C:18]([CH:30]=[C:31]([Cl:33])[CH:32]=1)[O:19][CH:20]([C:22]1[S:26][C:25]([N:27]=[C:28]=[O:29])=[N:24][N:23]=1)[CH3:21]>CCCCCC>[Cl:15][C:16]1[CH:17]=[C:18]([CH:30]=[C:31]([Cl:33])[CH:32]=1)[O:19][CH:20]([C:22]1[S:26][C:25]([NH:27][C:28](=[O:29])[N:5]([CH3:6])[CH2:4][CH:3]([O:7][CH3:8])[O:2][CH3:1])=[N:24][N:23]=1)[CH3:21]3.8 grams (0.032 mole) of methylaminoacetaldehyde dimethylacetal was added to a 50 milliliter benzene solution containing 10.0 grams (0.032 mole) of the 5-[1-(3,5-dichlorophenoxy)ethyl]-1,3,4-thiadiazol-2-yl isocyanate dimer (prepared above). The resulting solution was heated to reflux, 50 milliliters of hexane was added, and the solution cooled. The crystals were filtered off, and dried in a vacuum oven at 80° C. to give 7.9 grams of fluffy waxy crystals of 3-[5-[1-(3,5-dichlorophenoxy)ethyl]-1,3,4-thiadiazol-2-yl]-1-methyl-1-(2,2-dimethoxyethyl)urea. (Melting point 149°-152° C.).
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