[CH:1]([C:4]1[C:5]([O:16][CH3:17])=[C:6]([CH:10]=[C:11]([CH:13]([CH3:15])[CH3:14])[CH:12]=1)[C:7]([OH:9])=[O:8])([CH3:3])[CH3:2].[OH-].[K+].O.O.O.O.O.O.O.O.S([O-])([O-])(=O)=O.[Zn+2:33]>CO>[CH:1]([C:4]1[C:5]([O:16][CH3:17])=[C:6]([CH:10]=[C:11]([CH:13]([CH3:15])[CH3:14])[CH:12]=1)[C:7]([O-:9])=[O:8])([CH3:3])[CH3:2].[Zn+2:33].[CH:1]([C:4]1[C:5]([O:16][CH3:17])=[C:6]([CH:10]=[C:11]([CH:13]([CH3:15])[CH3:14])[CH:12]=1)[C:7]([O-:9])=[O:8])([CH3:3])[CH3:2]Five parts of 3,5-diisopropyl-2-methoxybenzoic acid was dissolved in 80 parts of methyl alcohol, followed by the addition of an aqueous solution of 1.3 parts of 96% potassium hydroxide in 10 parts of water. The resulting mixture was heated to 60° C. An aqueous solution of 3.2 parts of zinc sulfate heptahydrate in 10 parts of water was dropped into the resulting mixture over a period of 15 minutes. After the completion of the dropping, the obtained mixture was stirred at that temperature for 2 hours, cooled to a room temperature and filtered to recover a white crystalline precipitate. This precipitate was dispersed in 60 parts of water, washed therewith and filtered. The obtained filter cake was dried to give 4.8 parts of a white crystal. The melting point thereof was 104 to 107° C.
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