Patent ID: 7718633

Claim:
A compound having formula (I), (II), or (III) wherein: L 1 is selected from the group consisting of a bond, —C(O)—, and —C(O)O—, wherein the carbonyl of the —C(O)O— moiety is attached to A of formula (I), (II), or (III); L 2 is —(CR 1 R 2 ) m —, m is 1, 2, 3, 4, or 5; R 1 at each occurrence is independently selected from the group consisting of hydrogen and C 1 -C 12 alkyl; R 2 at each occurrence is independently selected from the group consisting of hydrogen and C 1 -C 12 alkyl; R 3 is selected from the group consisting of hydrogen, C 1 -C 12 alkyl, and arylalkyl; R 4 is selected from the group consisting of hydrogen, C 1 -C 12 alkyl, and arylalkyl; q is 1 or 2; t is 1 or 2; M a is selected from the group consisting of M 1 and M 2 ; M b is selected from the group consisting of M 1 and M 2 ; M 1 is selected from the group consisting of Na + , K + , and + N(R 5 )(R 6 )(R 7 )(R 8 ); M 2 is selected from the group consisting of Ca 2+ , Ba 2+ , Mg 2+ , Zn 2+ , and + N(R 9 )(R 10 )(R 11 )(R 12 ), as to R 5 and R 6 : R 5 is selected from the group consisting of hydrogen, alkyl, hydroxyalkyl, arylalkyl, and —C(═NH)NH 2 , and R 6 is selected from the group consisting of hydrogen, alkyl, hydroxyalkyl, and arylalkyl, or, alternatively, R 5 and R 6 , together with the nitrogen atom to which they are attached, form a piperidine ring; R 7 is selected from the group consisting of hydrogen and alkyl; R 8 is selected from the group consisting of hydrogen and alkyl; as to R 9 and R 11 : R 9 is -alkyl-N + (Z 1 )(Z 2 )(Z 3 ), and R 11 is selected from the group consisting of hydrogen and alkyl, or, alternatively, R 19 and R 11 , together with the nitrogen atom to which they are attached, form a piperazine ring; R 10 is hydrogen, alkyl or arylalkyl; R 12 is hydrogen or alkyl; Z 1 is selected from the group consisting of hydrogen and alkyl; Z 2 is selected from the group consisting of hydrogen and alkyl; Z 3 is selected from the group consisting of hydrogen, alkyl, and arylalkyl; and A is selected from the group consisting of provided that: when q is 1, M a is M 1 ; when q is 2, M 3 is M 2 ; when t is 1, M b is M 2 ; when t is 2, M b is M 1 ; and provided that: when A is L 1 is a bond, then L 2 is not —CH 2 —.