The invention relates to antibacterialcompounds of formula (1) wherein R1 represents alkoxyor halogen; U, V and W each represent CH, or one of U,V and W represents N and the others each representCH; A represents CH2 or O; G is CH=CH-E wherein Erepresents a phenyl group mono- or di-substituted withhalogen, or G is a group of one of the formulae (II), (III)hereafter wherein Z represent CH or N, Q represents Oor S and K represents O or S; and salts of suchcompounds.