| 摘要 |
A benzimidazole anthelmintic agent of formula (I) or a non-toxic salt thereof, wherein R1, which is in the 5- or 6position, is either (i) benzoyl, phenyloxy, phenylthio, phenylsulfinyl, phenylsulfonyl, phenylsulfonyloxy, C1-C6 alkyl, C1-C6 alkoxy, C1-C6 alkylthio, C1-C6 alkylsulfinyl, C1-C6 alkylsulfonyl or (C3-C7 cycloa1kyl)carbonyl, said phenyl groups, and the phenyl portion of said benzoyl group, optionally having 1 to 3 substituents each independently selected from halo, C1-C4 alkyl, halo-(C1-C4 alkyl), C1-C4 alkoxy, C1-C4 alkylthio, C1-C4 alkylsulfinyl, C1-C4 alkylsulfonyl, C2-C4 alkanoyl, nitro, isothiocyanato, and cyano; or (ii) a group of formula (a), where X is O, S, SO, SO2 or NR4 in which R4 is hydrogen, C1-C4 alkyl, phenyl or phenyl-(C1-C4 alkyl), said phenyl groups being optionally substituted by 1 or 2 substituents each selected from C1-C4 alkyl, halo, hydroxy and C1-C4 alkoxy; and R5 is H, C1-C4 alkyl, halo, hydroxy or C1-C4 alkoxy; formulae (b), (c), (d) where R1 is C1-C4 alkyl, allyl or phenyl, formulae (e), (f) or (g), R2 is C1-C4 alkyl; and R3 is C1-C4 alkyl.
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