PROBLEM TO BE SOLVED: To provide a novel compound that has an anti-trypanosome activity.SOLUTION: Provided is a compound represented by the formula (1) or a pharmaceutically acceptable salt thereof. (Ris C1 to 10 alkoxy group or the like; Ris alkyl group, alkoxy group, aryl group, heteroaryl group, alkenyl group, amino group or the like; Ris H, alkyl group, cycloalkyl group, cycloalkyl oxy group, aryl group, aryloxy group, heteroaryl group, heteroaryl oxy group, alkoxy group, cyclic amino group, cyclic amido group, alkenyl group, alkenyl oxy group, alkynyl group, alkynyl oxy group or the like; and Ris H.).