[CH:1]([NH:3][C:4]1[S:5][CH:6]=[C:7]([C:9](=O)[C:10]([OH:12])=[O:11])[N:8]=1)=[O:2].C(=O)(O)[O-].[Na+].[NH2:19][O:20][CH2:21][C:22]([NH2:24])=[O:23].Cl>O>[CH:1]([NH:3][C:4]1[S:5][CH:6]=[C:7]([C:9](=[N:19][O:20][CH2:21][C:22](=[O:23])[NH2:24])[C:10]([OH:12])=[O:11])[N:8]=1)=[O:2]To a solution of 2-(2-formamidothiazol-4-yl)-glyoxylic acid (4.63 g.) and sodium bicarbonate (1.95 g.) in water (230 ml.) was added 2-aminooxyacetamide (2.5 g.) and the mixture was stirred at room temperature for 6 hours while keeping at pH 5. After adjusting the solution to pH 1.5 with 10% hydrochloride acid, the precipitates were collected by filtration, washed with water and dried to give 2-(2-formamidothiazol-4-yl)-2-carbamoylmethoxyiminoacetic acid (syn isomer, 3.6 g.), mp 195° C. (dec.).
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