The invention is related to a novel compound represent by the following formula (I) or salt thereof, a plant disease controlling agent comprising the compound represented by the following formula (I) or salt thereof as active ingredient, and a plant disease controlling method comprising to apply the above plant disease controlling agent to the plant with disease. (Wherein, R1 and R2 represent hydrogen atom or methyl group, provided that R1 and R2 are not the same.)本發明係關於下述式(1)所示之新穎化合物或其鹽、以前述式(1)所示之化合物或其鹽作為有效成分之植物病害防治劑、及將前述植物病害防治劑施用於病害植物之植物病害防治方法；(式中，R1及R2係表示氫原子或甲基，惟R1與R2為相同之情形除外)。
