| 摘要 |
Compounds of formula (I) wherein R<1> is C1-C6 alkyl, C3-C6 alkenyl, or substituted C1-C4 alkyl wherein said substituent is halo, C1-C4 alkoxy, C2-C5 alkanoyl, C2-C5 alkoxycarbonyl, carboxy, mercapto or aryl; R<2> is C3-C8 alkyl, C3-C8 alkenyl, C3-C8 cycloalkyl or C5-C8 cycloalkenyl; R<3> is OH, C1-C4 alkoxy or C2-C5 alkanoyloxy; or R<3> is linked by a double bond and is =N-OR<5> wherein R<5> is H, C1-C4 alkyl or C2-C5 alkanoyl; and R<4> is HO, C1-C4 alkoxy, C2-C5 alkanoyloxy or halo; or R<4> is linked by a double bond and is =O or =N-OR<5>; or R<4> is a group of formula (II) wherein R<6> is HO, C1-C4 alkoxy, C2-C5 alkanoyloxy or halo, or R<6> is linked by a double bond and is =O or =N-OR<5>; with certain provisos when R<2> is isopropyl or sec-butyl; are broad spectrum antiparasitic agents useful for treating parasite infestations of livestock and domesticated animals. |
