A compound is provided which is useful as an active ingredient of an agricultural chemical having superior antimicrobial activity against various plant diseases and capable of controlling rice blast and so on at a low dose. A compound or salt thereof represented by the following general formula: (wherein, R 1 and R 2 represent a C 1 -C 6 alkyl group, aryl group, heteroaryl group, aralkyl group or R 1 and R 2 together represent a C 3 -C 10 cycloalkyl group, R 3 and R 4 represent a hydrogen atom, a C 1 -C 6 alkyl group or R 3 and R 4 together represent a C 3 -C 10 cycloalkyl group, R 5 represents a hydrogen atom, C 1 -C 6 alkyl group or acyl group, X represents a halogen atom, a C 1 -C 6 alkyl group, C 2 -C 6 alkenyl group, C 2 -C 6 alkynyl group, aryl group, heteroaryl group, C 1 -C 6 alkoxy group, amino group, acyl group, cyano group or N-hydroxyalkaneimidoyl group, Y represents a substituent selected from the group consisting of a halogen atom, C 1 -C 6 alkyl group, C 1 -C 6 alkoxy group and hydroxyl group, n represents an integer of 0 to 4, and m represents an integer of 0 to 6).