prov:value
| - Among the objective compound [1-a] of the present invention, as a preferred combination of R1, R2 and R3, there may be mentioned a compound wherein R1 is a halogen atom, a lower alkyl group, a halogeno-lower alkyl group, a lower alkoxy group, a hydroxy-lower alkyl group or cyano group, R2 is hydrogen atom, a halogen atom, a lower alkyl group or cyano group, and R3 is hydrogen atom or a halogen ato
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