Patent ID: 7566797

Claim:
A compound as shown in formula (I): wherein M is a cation selected from the group consisting of: proton, metal cations, and organic cations, R1 and R2 are independently selected from the group consisting of: hydrogen, C1-C30 alkyl, C1-C30 alkenyl, C1-C30 alkynyl, C1-C30 alkoxy, hydroxy, aryl, alkylaryl, arylalkyl, polyoxyalkyl, polyaminoalkyl, and alkylsilyl, further wherein R1 and R2 may optionally form together C2-C9 alkylene carbocyclic or C2-C9 alkylene carbocyclic containing nitrogen and/or oxygen, and R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 , and R 12 are independently selected from the group consisting of: hydrogen, C 1 -C 9 alkyl, hydroxy, C 1 -C 9 alkoxy, amine, C 1 -C 9 alkylamine, halogen, alkylphenyl, and phenyl, further wherein two vicinal or geminal C 1 -C 9 alkyl groups may be combined to form a carbocyclic ring of up to six carbon atoms.