| http://www.w3.org/ns/prov#value | - Other preferred embodiments of X* include carboxyl or the esters or amides thereof; halide, including F, Cl, Br and I; NO2 ; phosphate or phosphorate at low pH; --SOR or --SO2 R wherein R is an organic residue, typically alkyl (1-6 C); or --CN or --CF3.
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