Disclosed are compounds of Formula 1, N-oxides, and salts thereof, wherein Q, A, R1, R2, R3 and n are as defined in the disclosure. Also disclosed are compositions containing the compounds of Formula 1 and methods for treating helminth infections comprising administration to an animal a parasiticidally effective amount of a compound or a composition of the invention.本文揭露式1化合物、N-氧化物及其鹽類，其中Q、A、R1、R2、R3及n如揭露中所定義。亦揭露者為含有式1化合物之組成物及用以治療蠕蟲感染之方法，該方法包含對一動物投予一殺寄生蟲有效量的本發明化合物或組成物。
