prov:value
| - ro, (vi) a lower alkoxy, (vii) a phenyl-lower alkoxy, (viii) a phenylthio-lower alkyl, (ix) phenoxy, (x) a group of the formula: wherein R is a lower alkyl, a halogen-substituted lower alkyl, a phenyl which may optionally have one to three substituents selected from a halogen atom, a lower alkyl and a lower alkoxy, or pyridyl, and 1 is an integer of 0, 1 or 2, (xi) a halogen atom, (xii) a phenyl-l
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