Imidazonaphthyridines

A compound of the formula (I):

• wherein
• R1 is selected from the group consisting of:
• —C1-20 alkyl-NR3-Q-X—R4 and —C2-20 alkenyl-NR3-Q-X—R4 wherein Q is —CO—;
• X is —NR3—, and
• R4 is aryl, or —C1-20 alkyl or C2-20 alkenyl that is unsubstituted or substituted by one or more substituents selected from the group consisting of:
• -aryl;
• —O—C1-20 alkyl,
• —O—(C1-20alkyl)0-1-aryl;
• —C1-20 alkoxycarbonyl;
• —S(O)0-2—C1-20 alkyl;
• —S(O)0-2—(C1-20 alkyl)0-1-aryl;
• —N(R3)2;
• —NR3—CO—O—C1-20alkyl;
• —N3;
• oxo;
• -halogen;
• —NO2;
• —OH;
• and
• —SH;
• R2 is selected from the group consisting of:
• -hydrogen;
• —C1-10 alkyl;
• —C2-10 alkenyl;
• -aryl;
• —C1-10 alkyl-O—C2-10 alkenyl;
• and
• —C1-10 alkyl or C2-10 alkenyl substituted by one or more substituents selected from the group consisting of:
• —OH;
• -halogen;
• —N(R3)2;
• —CO—C1-10 alkyl;
• —N3;
• -aryl;
• and
• —CO-aryl;
• each R3 is independently selected from the group consisting of hydrogen and C1-10 alkyl;
• each R is independently selected from the group consisting of hydrogen, C1-10 alkyl, C1-10 alkoxy, halogen and trifluoromethyl;
• and n is 3;
• or a pharmaceutically acceptable salt thereof.