prov:value
| - ydrogen atom, an alkyl group, an aryl group, an alkoxy group, an acetyl group, a nitro group, a halogen atom or a carbonyl group, provided that adjacent groups as selected from among R2, R3, R4 and R5 may combine to form a ring; and Y is a counter ion; anda binding substance selected from the group consisting of an antigen, an antibody, a protein other than an antigen or an antibody, a nucleic aci
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