A compound with the Formula (I): A-B-C (I) or a pharmaceutically acceptable salt and tautomeric forms or stereoisomers thereof, wherein A is of one of the following formulae: (A1a), (A2a), (A2b), (A3a) and (A3b); B is of formula: (B-1); and C is of formula: (C-1a), (C-1b), (C-1c) or (C-1d).