Patent ID: 8137416

Claim:
A compound of the general formula (I) wherein R 1 and R 8 are independently selected from the group consisting of: unsubstituted unbranched C 1-6 alkyl, unsubstituted branched C 3-6 alkyl, substituted unbranched C 1-6 alkyl, and substituted branched C 3-6 alkyl, R 2 and R 7 are independently selected from the group consisting of: substituted aryl, unsubstituted aryl, substituted —(CH 2 ) n -aryl, and unsubstituted —(CH 2 ) n -aryl wherein n=1, 2, 3 or 4, R 3 and R 6 are independently selected from the group consisting of: hydrogen, unsubstituted unbranched C 1-6 alkyl, unsubstituted branched C 3-6 alkyl, substituted unbranched C 1-6 alkyl, substituted branched C 3-6 alkyl, unsubstituted unbranched C 1-6 alkoxy, unsubstituted branched C 3-6 alkoxyl substituted unbranched C 1-6 alkoxy, substituted branched C 3-6 alkoxy, halogen, —NHCO—(C 1-6 alkyl) with an unbranched C 1-6 alkyl group, which is substituted or unsubstituted, —NHCO—(C 3-6 alkyl) with a branched C 3-6 alkyl group, which is substituted or unsubstituted, and —NHCONH 2 , R 4 and R 5 are independently selected from the group consisting of: hydrogen, unsubstituted unbranched C 1-6 alkyl, unsubstituted branched C 3-6 alkyl, substituted unbranched C 1-6 alkyl, substituted branched C 3-6 alkyl, and halogen, and wherein the compound of the general formula (I) contains at least one anionic substituent.