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##STR1## wherein A is benzyl group which has suitable substituent(s) or phenyl group which may have suitable substituent(s), PA1 A.sup.a is benzyl group which may have suitable substituent(s) or phenyl group which may have suitable substituent(s), PA1 B and D are each lower alkyl, PA1 C is hydrogen or lower alkyl, PAL and a pharmaceutically acceptable salt thereof. The compound or a salt thereof of the present invention has excellent parasiticidal activities as an anthelmintic agent for animals and human bodies.