Patent ID: 8426625

Claim:
A compound of formula (I): in which: R is selected from the group consisting of (C 2 -C 25 )alkyl and (C 2 -C 25 )alkenyl, wherein R taken together with the carboxylate group to which it is bound is the residue of a saturated, mono-unsaturated or poly-unsaturated fatty acid; n and m are each independently an integer of two to eight; p is one or two; A is selected from the group consisting of —B—, —B—(CH 2 ) r —B—, and —B—(CH 2 ) r —B—(CH 2 ) z —B—, wherein r and z are an integer from 2 to 8, and B is a —NR 1 — or —N(R 2 ) 2 + 1/pQ −p group, in which R 1 is selected from hydrogen, (C 1 -C 4 )alkyl, (C 1 -C 4 )acyl, tert-butoxycarbonyl, and R 2 is selected from hydrogen and (C 1 -C 4 )alkyl; and Q −p is an anion selected from chloride, bromide, iodide, nitrate, sulphate, hydrogen sulphate, perchlorate, R 3 COO − wherein R 3 has the same meanings as R, independently from one another, and R 4 —O—SO 3 − wherein R 4 is (C 2 -C 14 )alkyl with the proviso that, when Q −p is selected from chloride, bromide, iodide, nitrate, sulphate, hydrogen sulphate, perchlorate, R is not (C 2 -C 4 )alkyl.