| http://www.w3.org/ns/prov#value | - (I) In the first place, a 4-halogeno-3-oxo-2-oxyiminobutyric acid derivative of the formula (VII): ##STR10## wherein X is halogen, e.g. chlorine or bromine; R6 is hydrogen or methyl; R7 is a lower alkyl of 1 to 3 carbon atoms, e.g. methyl, ethyl or propyl is reacted with thiourea to obtain a 2-(2-aminothiazol-4-yl)-2-oxyiminoacetic acid derivative of the formula (VIII): ##STR11## wherein R6 and R7
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