The invention relates to antibacterial compounds of formula I wherein R1 is H or halogen; R2 is the group M; R3 is H or halogen; M is MA or MBwherein A is a bond or C≡C; R1A is H or halogen; R2A is H, alkoxy or halogen; R3A is H, alkoxy, hydroxyalkoxy, hydroxyalkyl, 1,2-dihydroxyethyl, dialkylamino, 1-hydroxymethyl-cycloprop-1-yl, 1-((dimethylglycyl)oxy)methyl-cycloprop-1-yl, 3-hydroxyoxetan-3-yl, morpholin-4-ylalkyl or morpholin-4-ylalkoxy; and R1B is a group as defined in claim 1; and salts thereof.本發明係關於式I之抗菌化合物及其鹽,其中R1係H或鹵素;R2係基團M;R3係H或鹵素;M係MA或MB其中A係鍵或C≡C;R1A係H或鹵素;R2A係H、烷氧基或鹵素;R3A係H、烷氧基、羥基烷氧基、羥基烷基、1,2-二羥基乙基、二烷基胺基、1-羥基甲基-環丙-1-基、1-((二甲基甘胺醯基)氧基)甲基-環丙-1-基、3-羥基氧雜環丁-3-基、嗎啉-4-基烷基或嗎啉-4-基烷氧基;且R1B係如申請專利範圍請求項1中所定義之基團。