Compound of general formula I, wherein Z is a linear hydrocarbyl chain selected from alkylene, alkenylene and alkynylene, containing 2 to 20 carbon atoms, preferably 6 to 16 carbon atoms, more preferably 6 to 14 carbon atoms, even more preferably 8 to 12 carbon atoms, most preferably 10 carbon atoms, or preferably 8 to 16 or 10 to 15 carbons, wherein - one or more carbon atoms (typically -CH 2 - groups) in the hydrocarbyl chain may optionally be replaced by one or more 5-membered or 6-membered aromatic rings or heteroaromatic rings containing the heteroatoms O, S and/or N, said aromatic or heteroaromatic rings being preferably selected from phenylene, triazolylene or pyridylene, and/or - one or more carbon atoms (typically -CH 2 - groups) in the hydrocarbyl chain may optionally be replaced by one or more heteroatoms or heteroatom-containing moieties selected from O, S, NH, N-OH, and/or - the hydrocarbyl chain atoms can be unsubstituted or substituted by one or more substituents selected independently from the group comprising C1-C4 alkyl, C1-C4 alkoxy, C1-C4 alkylthio, C1-C4 acyloxy, N(H or C1-C4 alkyl) 2 wherein alkyls are the same or different, phenyl, benzyl, OH, =O, SH, =S, =N-OH, F, Cl, Br, I; each of R1, R2, R3 is independently selected from the group comprising C1-C10 alkyl, C6-C12 aryl, C6-C12-aryl-C1-C2-alkyl, C5-C12 heteroaryl, C3-C8 cycloalkyl, wherein each of R1, R2, R3 can optionally and independently from others be substituted by one or more substituents selected independently from the group comprising C1-C4 alkyl; C1-C4 alkoxy; C1-C4 alkylthio; N(H or C1-C4 alkyl) 2 wherein the alkyls are the same or different; OH; =O; SH; =S; =N-OH; F; Cl; Br; I; each of R4, R5 and R6 is selected from CH and N, whereas at least two of R4, R5 and R6 are N; X - is a pharmaceutically acceptable anion; Y is independently on each occurrence selected from the group comprising OH, SH, NH 2, F, Cl, Br, I and H. Z is a linear hydrocarbyl chain selected from alkylene, alkenylene and alkynylene, containing 2 to 20 carbon atoms, preferably 6 to 16 carbon atoms, more preferably 6 to 14 carbon atoms, even more preferably 8 to 12 carbon atoms, most preferably 10 carbon atoms, or preferably 8 to 16 or 10 to 15 carbons, wherein - one or more carbon atoms (typically -CH 2 - groups) in the hydrocarbyl chain may optionally be replaced by one or more 5-membered or 6-membered aromatic rings or heteroaromatic rings containing the heteroatoms O, S and/or N, said aromatic or heteroaromatic rings being preferably selected from phenylene, triazolylene or pyridylene, and/or - one or more carbon atoms (typically -CH 2 - groups) in the hydrocarbyl chain may optionally be replaced by one or more heteroatoms or heteroatom-containing moieties selected from O, S, NH, N-OH, and/or - the hydrocarbyl chain atoms can be unsubstituted or substituted by one or more substituents selected independently from the group comprising C1-C4 alkyl, C1-C4 alkoxy, C1-C4 alkylthio, C1-C4 acyloxy, N(H or C1-C4 alkyl) 2 wherein alkyls are the same or different, phenyl, benzyl, OH, =O, SH, =S, =N-OH, F, Cl, Br, I; - one or more carbon atoms (typically -CH 2 - groups) in the hydrocarbyl chain may optionally be replaced by one or more 5-membered or 6-membered aromatic rings or heteroaromatic rings containing the heteroatoms O, S and/or N, said aromatic or heteroaromatic rings being preferably selected from phenylene, triazolylene or pyridylene, and/or - one or more carbon atoms (typically -CH 2 - groups) in the hydrocarbyl chain may optionally be replaced by one or more heteroatoms or heteroatom-containing moieties selected from O, S, NH, N-OH, and/or - the hydrocarbyl chain atoms can be unsubstituted or substituted by one or more substituents selected independently from the group comprising C1-C4 alkyl, C1-C4 alkoxy, C1-C4 alkylthio, C1-C4 acyloxy, N(H or C1-C4 alkyl) 2 wherein alkyls are the same or different, phenyl, benzyl, OH, =O, SH, =S, =N-OH, F, Cl, Br, I; each of R1, R2, R3 is independently selected from the group comprising C1-C10 alkyl, C6-C12 aryl, C6-C12-aryl-C1-C2-alkyl, C5-C12 heteroaryl, C3-C8 cycloalkyl, wherein each of R1, R2, R3 can optionally and independently from others be substituted by one or more substituents selected independently from the group comprising C1-C4 alkyl; C1-C4 alkoxy; C1-C4 alkylthio; N(H or C1-C4 alkyl) 2 wherein the alkyls are the same or different; OH; =O; SH; =S; =N-OH; F; Cl; Br; I; each of R4, R5 and R6 is selected from CH and N, whereas at least two of R4, R5 and R6 are N; X - is a pharmaceutically acceptable anion; Y is independently on each occurrence selected from the group comprising OH, SH, NH 2, F, Cl, Br, I and H.