Patent ID: 7465747

Claim:
A labeling reagent for fluorescent labeling comprising a compound having a 2,2′:6′,2″-tripyridine skeleton or a 2,6-dipyrazolopyridine skeleton wherein the labeling reagent comprises the compound having a 2,2′:6′,2″-tripyridine skeleton represented by the general formula [1]: wherein R 1 represents a 4-biphenyl group or a 4-biphenyl group having an active substituent or a compound represented by the general formula [2]: wherein R represents an aryl group, an aryl group having an active substituent, a heterocyclic group or a heterocyclic group having an active substituent and has a binding group capable of binding to a substance to be labeled and a binding group capable of forming a complex together with a rare earth ion.