abstract |
According to the present invention there is provided a compound of formula (I) or a derivative wherein the NR 1 group is quaternarised: (I) (Wherein, A is a C 2 alkylene group and -8; R 1, R 2, R 3, and R 4 are independently hydrogen, C 1 -4 alkyl, and C 2 -4-dihydroxydiphenyl is selected from hydroxyalkyl, Wherein the carbon atom attached to the nitrogen atom does not have a hydroxyl group and the carbon atom is not substituted with two hydroxyl groups, or R 2 And R 3 is R 2 And and R 3 are forming a group which forms a heterocyclic ring together with the attached nitrogen atom, C 2 -6 alkylene; X 1 , X 2 And X 3 is independently hydrogen, hydroxyl, NR 1 -A-NR 2 R 3 R 4 + (Z m -) is selected from 1 / m, halogeno-amino, C 1 -4 alkoxy, C 2 -8 alkanoyloxy; (Z m − ) 1 / m is the anion of charge m). |