Patent ID: 8802874

Claim:
A compound of the general formula wherein: A is hydroxy, alkoxy, aryloxy, amino, alkylamino, dialkylamino, or -OM, where M is a cation selected from the group consisting of ammonium, tetra-alkyl ammonium, Na, K, Mg, and Zn; and R a and R b are independently selected from the group consisting of hydrogen, alkyl, aryl, heteroaryl, acyl, silyl, alkoxyacyl and aminoacyl; R 2 is hydrogen, alkyl, perfluoroalkyl, aryl and heteroaryl; R 5 is selected from the group consisting of (i)-(iv) as follows: i) CH 2 CH(R 6 )CH 2 , where R 6 is hydrogen, alkyl, perfluoroalkyl, aryl, heteroaryl, fluoro, hydroxy or alkoxy; ii) CH 2 C(R 6 R 7 )CH 2 , where R 6 and R 7 are each independently alkyl, perfluoroalkyl, aryl, or fluoro, or R 6 and R 7 are connected together to form a carbocyclic or heterocyclic ring; iii) CH 2 OCH 2 , CH 2 C(O)CH 2 , or CH 2 CH 2 ; and (iv) R 5 is a carbocyclic, heterocyclic, aryl or heteroaryl ring; and R 8 and R 9 are independently selected from the group consisting of hydrogen, alkyl, perfluoroalkyl, alkoxy, aryl and heteroaryl, or R 8 and R 9 are connected together to form a carbocyclic or heterocyclic ring.