1. A compound of Formula (I):
wherein R1 is an unsubstituted or substituted C1-12 straight chain alkyl, an unsubstituted or substituted C3-12 branched chain alkyl, an unsubstituted or substituted C2-12 straight chain alkenyl, an unsubstituted or substituted C3-12 branched chain alkenyl, an unsubstituted or substituted C1-12 alkoxy, halo, an unsubstituted or substituted benzyl, an unsubstituted or substituted phenyl, amino, an unsubstituted or substituted
C1-12 alkylamino, an unsubstituted or substituted C6-30 arylamino, an unsubstituted or substituted C1-12 dialkylamino, an unsubstituted or substituted C6-30 diarylamino, an unsubstituted or substituted tolyl, xylyl, anisyl, mesityl, an unsubstituted or substituted C1-12 alkylthio, an unsubstituted or substituted C1-12 alkyloxy, an unsubstituted or substituted phenoxy, an unsubstituted or substituted benzyloxy, or nitro;
R2 and R3 are selected from the group consisting of hydrogen, an unsubstituted or substituted C1-12 straight chain alkyl, an unsubstituted or substituted C3-12 branched chain alkyl, an unsubstituted or substituted C2-12 straight chain alkenyl, an unsubstituted or substituted C3-12 branched chain alkenyl, an unsubstituted or substituted C3-8 cycloalkyl, benzyl or substituted benzyl, and phenyl or substituted phenyl; and R4 is polymer;
M+x is a pharmaceutically acceptable cation, x is the valence of the cation, and a and b are the smallest integers that result
in a neutral compound.
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