PROBLEM TO BE SOLVED: To provide an acaricide.SOLUTION: A compound represented by formula [1] is provided. In the formula: R1 and R2 are each a hydrogen atom, a halogen atom or the like R3 is a hydrogen atom, a 1-4C alkyl group or the like R3 and X form together a group represented by formula [A] R4 is a hydrogen atom or a 1-4C alkyl group R5, R6 and R7 are each a 1-4C alkyl group or the like and R8 and R9 are each a halogen atom or the like.COPYRIGHT: (C)2012,JPO&INPIT【課題】殺ダニ剤を提供する。【解決手段】式[I]により表される化合物。式中、R1およびR2は、水素原子、ハロゲン原子等を示し、R3は水素原子、C1~C4のアルキル基等を示し、R3とXは一緒になって、を形成し、R4は水素原子またはC1~C4のアルキル基を示し、R5、R6、R7はC1~C4のアルキル基等を示し、R8およびR9は、ハロゲン原子等を示す。【選択図】なし