| http://www.w3.org/ns/prov#value | - rifluoromethyl-2-pyrimidinyl, 4,6-dimethoxy-2-pyrimidinyl, 2,6-dimethoxy-4-pyrimidinyl or 2-quinolyl, R.sub.1 and R.sub.2 are as defined above.The compounds of the formula (II-a) or their salts also can be produced by a process mentioned below. ##STR11##The reaction is conducted usually in the presence of a solvent and a base.The solvent may include aromatic hydrocarbons such as benzene, toluene o
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