Antibacterial compounds

A compound of formula (I);

• wherein:
• A is a 5- or 6-membered ring, which is aromatic or non-aromatic, and optionally containing 1 or 2 heteroatoms that are nitrogen, sulfur or oxygen;
• B is a 5-membered aromatic ring containing 1 or 2 nitrogen heteroatoms;
• X1 is ═N— or ═C(R10a)—;
• X1b is ═N— or ═C(R3)—.
• X1c is ═C(R10a) or ═N—;
• X1d is ═C(R10a) or ═N—, and wherein a maximum of two of X1, X1b, X1c and C1d are ═N—;
• one of X2 and X3 in the D ring is ═N— and the other is ═N— or ═C(R10b)—;
• L1 is a linker group;
• L2 is an optional linker group;
• R1 is one or more optional substituents independently that are halo, —R5a, —O—R5b, —C(═O)—R5c, —C(═O)—N(R6)(R7), —CN or —N(R6a)R6b;
• or any two R1 groups are taken together when attached to adjacent atoms of the A ring to form a 5- or 6-membered ring optionally containing one or two heteroatoms, and which ring is optionally substituted by one or two C1-3 alkyl substituents;
• R2 is —C1-4 alkyl optionally substituted by one or more substituents that are halo or —OC1-3 alkyl;
• R3 is a substituent that is H, F, —C1-3 alkyl or —O—C1-3 alkyl;
• R4 is H, —R8a, —C(═O)—R8b, —SO2—R9 or Het1;
• R5a and R5b independently are hydrogen or —C1-4 alkyl optionally substituted by one or more substituents that are halo, —O—CH3 or phenyl;
• R5 is —C1-3 alkyl;
• R6 and R7 are independently H or —C1-3 alkyl;
• R6a and R6b independently are H, C1-6 alkyl or R6a and R6b are linked together to form a 3- to 6-membered ring;
• R8a is —C1-4 alkyl, optionally substituted by one or more substituents that are halo, —OC1-3 alkyl, —CN or Het2;
• R8b is hydrogen or —C1-3 alkyl optionally substituted by one or more fluoro atoms;
• R9 is Het3, —N(R6c)R6d or —C1-4 alkyl optionally substituted by one or more substituents that are halo or —O—CH3;
• R6c and R6d independently represent are H, C1-6 alkyl or R6c and R6d are linked together to form a 3- to 6-membered ring;
• R10a and R10b independently represent are H, halo, C1-4 alkyl (optionally substituted by one or more substituent(s) that are fluoro, —CN, —R11a, —OR11b, —N(R11c)R11d, and/or —C(O)N(R11e)R11f or —O—C1-4 alkyl itself optionally substituted by one or more substituent(s) that are fluoro, —R11g, —OR11h or —N(R11i)R11j;
• R11a, R11b, R11c, R11d, R11e, R11f, R11g, R11h, R11i and R11j independently are hydrogen or C1-3 alkyl optionally substituted by one or more fluoro atoms;
• R12a and R12b independently represent are hydrogen or C1-3 alkyl;
• or R12a and R12b are linked together to form a 3- to 6-membered ring;
• R12c and R12d independently are hydrogen or C1-3 alkyl;
• or R12c and R12d are linked together to form a 3- to 6-membered ring;
• Het1, Het2 and Het3 independently are a 5- or 6-membered aromatic ring containing one or two heteroatoms, optionally substituted by one or more substituents that are halo or C1-3 alkyl optionally substituted by one or more fluoro atoms,
• or a pharmaceutically-acceptable salt thereof.