prov:value
| - or its its activated form, wherein R3 and R4 are an alkyl or a carboxyalkyl; R2 is a reactive group, solid support, carrier molecule, alkyl, alkyl substituted by sulfo or carboxyalkyl; R5 is independently hydrogen, amino, sulfo, trifluoromethyl, or halogen; or C1-C6 alkyl, C1-C6 alkoxy, C1-C6 alkylamino, C2-C12 dialkylamino, each of which is optionally further substituted by carboxy, sulfo, amino,
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