Pyridines and uses thereof

A compound or physiologically acceptable salt thereof, wherein the compound has the formula:

• wherein:
• X, Y and Z are N, CH or CR where R is alkyl, alkoxy, Cl, Br, NH2, NHR′ or NR′R″ where R′ and R″ independently are alkyl;
• Q is NR, RN—(CH2)n, (CH2)n—NR, O, O—(CH2)n, (CH2)n—O, S, S—(CH2)n, or (CH2)n—S, where n is 1-10 and R is H or alkyl;
• R1 is H, OH, alkyl, alkoxy, Cl, F, Br, CR3 where R3 is Cl3, F3 or Br3, NH2, NHR or NRR′ where R and R′ independently are alkyl;
• R2 is H, OH, alkyl, alkoxy, Cl, F, Br or CR3 where R3 is Cl3, F3 or Br3;
• R3 is H, alkyl, alkoxy, Cl, CCl3, NH2, NHR or NRR′ where R and R′ independently are alkyl or acyl;
• R4, R5, and R are independently H, OH, alkyl, alkenyl, alkynyl, alkoxy, (CH2)n—OR where R is H or alkyl and n is 1-10, Cl, F, Br, CR3 where R3 is Cl3, F3 or Br3 heterocycle, N+(═O)O−, C≡N, N3, SH, SR or S(═O)2R where R is alkyl, NH2, NHR or NRR′ where R and R′ independently are alkyl, or R4 and R5 or R5 and R6 are taken together with the benzene ring to form a heterocycle;
• and with the proviso that one of X, Y and Z is N.