The invention provides compounds which exert excellent fungicidal activities against various plant diseases and are useful as active ingredients of pesticides permitting the control of rice blast and so on even in low dosages. Compounds represented by the general formulae (1a) to (1d) or salts thereof: (1a) (1b) (1c) (or) (1d) wherein R
1
and R
2
are each C
1-6
alkyl or the like; R
3
and R
4
are each hydrogen, halogeno, or the like; R
5
is hydrogen, C
1-6
alkyl, or the like; X is halogeno, C
1-6
alkyl, or the like; Y is halogeno, C
1-6
alkyl, or the like; n is an integer of 0 to 4; and m is an integer of 0 to 6.