| http://www.w3.org/ns/prov#value | - ne, preferably at least two, of R1, R2, or R3 contains a CO2M moiety; R4, R5, R6 are independently selected from H, alkyl, aryl, alkenyl, carboxy or alkylcarboxy, ester and functionalized esters, anhydride, amide, cyano, urea, alcohol, ether, acetal, phosphino, phosphono, sulfonate, sulfonamide, heterocycles such as imidazole, thiol, thioester;, and mixtures thereof, the indices x, y, and z are ea
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