prov:value
| - nal group, for example, that does not directly react with a carboxyl, hydroxyl, amino, or a thiol group, and R18 is a functional group that can react with a carboxyl, hydroxyl, amino, or thiol group; and R9???R12 and R14???R17 are each independently H, alkyl, halo, amino, sulfonato, R21COOH, R21OR22, R21SR22, or R21COOR22 wherein R21 is a bond or alkylene and R22 alkyl, or optionally R11 and R12 t
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