A compound represented by general formula (I) or a salt thereof, a process for producing the same, an intermediate for the production thereof, and a bactericide (fungicide) containing the same as the active ingredient wherein R1 represent optionally substituted aryl, optionally substituted heterocycle, mono- or di-substituted methyleneamino, optionally substituted (substituted imino)methyl, optionally substituted alkyl, optionally substituted alkenyl, optionally substituted alkynyl, substituted carbonyl or substituted sulfonyl; R2 represents alkyl, alkenyl, alkynyl or cycloalkyl; R3 represents optionally substituted heterocycle; R4 represents hydrogen, alkyl, alkoxy, halogen, nitro, cyano or haloalkyl; M represents oxygen, S(O)i (i being 0, 1 or 2), NR16 (R16 being hydrogen, alkyl or acyl) or a single bond; n represents 0 or 1, provided n represent 1 when R3 represents imidazol-1-yl or 1H-1,2,4-triazol-1-yl; and the symbol˜represents the E form, Z form or a mixture thereof.