Substituted 1,2-dihydro-3H pyrrolo[1,2-c]imidazol-3 one antibacterials

A compound of formula I

• wherein
• M is one of the groups MA, MB and MC represented below
• and either R1 represents H and, when M is MA, R2 represents SO3H, phosphonooxymethyl or the group L2A represented below
• wherein R2A represents (C1-C4)alkylamino(C1-C4)alkyl, [di(C2-C4)alkylamino]methyl, {(methyl)[(C2-4)alkyl]amino}methyl, [di(C1-C4)alkylamino](C2-C4)alkyl, morpholin-4-yl-(C1-C4)alkyl, phosphonooxy(C1-C4)alkyl, phosphonooxymethoxy, 2-(phosphonooxy-(C1-C4)alkyl)-phenyl, (2-(phosphonooxy)-phenyl)-(C1-C4)alkyl or [2-(phosphonooxy-(C1-C4)alkyl)-phenyl]-(C1-C4)alkyl, or, when M is MB or MC, R2 represents PO3H2, SO3H, phosphonooxymethyl or the group L2BC represented below
• wherein R2BC represents (C1-C4)alkylamino(C1-C4)alkyl, [di(C1-C4)alkylamino](C1-C4)alkyl, morpholin-4-yl-(C1-C4)alkyl, phosphonooxy(C1-C4)alkyl, phosphonooxymethoxy, 2-(phosphonooxy-(C1-C4)alkyl)-phenyl, (2-(phosphonooxy)-phenyl)-(C1-C4)alkyl or [2-(phosphonooxy-(C1-C4)alkyl)-phenyl]-(C1-C4)alkyl, or R2 represents H and R1 represents PO3H2, SO3H, phosphonooxymethyl or the group L1 represented below
• wherein R1A represents (C1-C4)alkylamino(C1-C4)alkyl, [di(C1-C4)alkylamino](C1-C4)alkyl, morpholin-4-yl-(C1-C4)alkyl, phosphonooxy(C1-C4)alkyl, phosphonooxymethoxy, 2-(phosphonooxy-(C1-C4)alkyl)-phenyl, (2-(phosphonooxy)-phenyl)-(C1-C4)alkyl or [2-(phosphonooxy-(C1-C4)alkyl)-phenyl]-(C1-C4)alkyl;
• it being understood that the molecule is always such that its R2 group is attached to the oxygen atom of its MA, MB and MC group;
• or a salt thereof.