The invention relates to antibacterial compounds of formula (I) wherein R1 is H or halogen; R2 is alkynyloxy or the group M; R3 is H or halogen; M is one of the groups (A, B, C, D) wherein A is a bond, CH2 CH2, CH=CH or C≡C and R1A, R2A, R3A, R1B and R1C are as defined in claim 1; and salts thereof.
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