C([O-])(=O)C.[Ni+2:5].C([O-])(=O)C.CCOCCO.[CH3:16][NH:17][C:18]1[C:19](=[CH:23][CH:24]=[CH:25][CH:26]=1)[C:20]([OH:22])=[O:21]>O>[Ni:5].[CH3:16][NH:17][C:18]1[C:19](=[CH:23][CH:24]=[CH:25][CH:26]=1)[C:20]([OH:22])=[O:21]23.8 g (0.1 mol) of nickel acetate was added to 500 ml of ethyl cellosolve and stirred. The mixture was heated to 50° C., and 30.2 g (0.2 mol) of N-methyl-anthranilic acid was gradually added. The mixture was subjected to reaction for 2 hours at about 130° C. under refluxing and then dispersed in 2 liters of water. After 1 hour, the dispersion was subjected to filtration and the precipitate was washed with water until neutrality. The precipitate was then dried at 90° C. to obtain about 29 g of pale blue powder.
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