The invention relates to antibacterial compounds of formula I (I) wherein R is H, cyano, alkoxy, cyanomethoxy, cycloalkylmethoxy, hydroxyalkoxy, alkoxyalkoxy, alkoxycarbonyl, 2-ethoxy-2-oxoethoxy, 2-(methylamino)-2-oxoethoxy, (1-cyanocyclobutyl)methoxy, 3-hydroxy-pyrrolidin-1-yl or 3,4-dihydroxycyclopentyl)methoxy; U1 is N or CR1, U2 is N or CR1, U3 is N or CR3 and U4 is N or CR1, it being understood that at most three of U1, U2, U3 and U4 can be N at the same time; V1 is N or CR5, V2 is N or CR6, V3 is N or CR7 and V4 is N or CH, it being understood that at most two of V1, V2, V3 and V4 can be N at the same time; R1 is H, cyano, hydroxy or alkoxy; R2 is H, hydroxy or alkoxy; R3 is H, cyano, hydroxy, alkoxy or carboxamido; R4 is H or alkoxy; R5 is H, hydroxy or halogen; R6 is H, hydroxy or halogen; R7 is H; the dotted line “______” represents a bond or is absent; W represents CH or N when the dotted line “______” is a bond, or W represents CH2 when the dotted line “______” is absent; X represents CH or N; and Q represents O or S; and salts thereof.