[C@@H:1]1([C:7]([OH:9])=[O:8])[O:3][C@@H:2]1[C:4]([OH:6])=[O:5].[OH-:10].[Na+:11]>>[C:7]([C@@H:1]([C@H:2]([C:4]([O-:6])=[O:5])[OH:10])[OH:3])([O-:9])=[O:8].[Na+:11].[Na+:11]Clean microbic cells obtained similarly to Example 3 were placed in 100 ml of an aqueous solution containing as the substrate 1.0 g of cis-epoxysuccinic acid and having the pH value thereof adjusted to 8.0 with an aqueous sodium hydroxide solution and agitated at 35° C for four hours. The substrate was wholly used up to produce 1.40 g of sodium L(+)-tartrate. The yield was 95 percent. The reaction mixture was treated by following the procedure of Example 2. The L(+)-tartaric acid consequently obtained was found to have an optical purity of 100 percent.
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