[NH2:1][C:2]1[S:3][CH:4]=[C:5]([C:7](=[N:11][O:12][CH:13]2[CH2:18][CH2:17][CH2:16][CH2:15][CH2:14]2)[C:8]([OH:10])=[O:9])[N:6]=1.[C:19](OC(=O)C)(=[O:21])C.C(=O)(O)[O-].[Na+].Cl>C(O)=O>[CH:19]([NH:1][C:2]1[S:3][CH:4]=[C:5]([C:7](=[N:11][O:12][CH:13]2[CH2:18][CH2:17][CH2:16][CH2:15][CH2:14]2)[C:8]([OH:10])=[O:9])[N:6]=1)=[O:21]2-(2-Aminothiazol-4-yl)-2-cyclohexyloxyiminoacetic acid (syn isomer, 1.5 g.), acetic anhydride (2.27 g.) and formic acid (1.03 g.) were treated in a similar manner to that of Example F-(5), and the oil obtained was suspended in an aqueous solution of sodium bicarbonate. The suspension was adjusted to pH 3.5 with 10% hydrochloric acid. The precipitates were collected by filtration, washed with water and dried to give 2-(2-formamidothiazol-4-yl)-2-cyclohexyloxyiminoacetic acid (syn isomer, 1.0 g.), mp. above 230° C.
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