prov:value
| - The compound of claim 40, wherein Y is a reactive group selected from the group consisting of a carboxyl, an amine, an ester, a thioester, a sulfonyl halide, an alcohol, a thiol, a succinimidyl ester, an isothiocyanate, an iodoacetamide, a maleimide, and a hydrazine. 43.
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