[CH:1](=O)[C:2]1[C:3]([O:8][CH3:9])=[CH:4][CH:5]=[CH:6][CH:7]=1.[SH:11][CH:12]([CH3:18])[C:13](OCC)=[O:14].C(=O)([O-])[O-].[NH4+:23].[NH4+]>C1(C)C=CC=CC=1>[CH3:9][O:8][C:3]1[CH:4]=[CH:5][CH:6]=[CH:7][C:2]=1[CH:1]1[NH:23][C:13](=[O:14])[CH:12]([CH3:18])[S:11]1A mixture of 13.6 g of o-anisaldehyde, 13.4 g of ethyl 2-mercaptopropionate and 6 g of ammonium carbonate in 250 ml of toluene was refluxed at 110° C. for 2 hours in a flask provided with a Dean-Stark apparatus while removing the distilled water. The crystals which separated out after leaving the reaction mixture for a night were collected by filtering and recrystallized from hot benzene to obtain the object, colourless prisms melting at 187° to 187.5° C. in an amount of 21 g corresponding to a yield of 94%.
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