[CH2:1]([O:3][C:4]([N:6]=[C:7]=[S:8])=[O:5])[CH3:2].[NH3:9]>C(O)C>[CH2:1]([O:3][C:4]([NH:6][C:7]([NH2:9])=[S:8])=[O:5])[CH3:2]To 0.1 mole of ethoxycarbonyl isothiocyanate in ethanol (50 ml) is added 50 ml of a 2M ethanolic solution of ammonia. After 2 hours at room temperature, the precipitated product is collected by filtration and used in the next step.
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