| abstract |
To provide a reagent with excellent stability under storage, which can detect a subject compound to be measured with higher specificity and sensitibity. n Complexes of a compound represented by the general formula (I): ##STR1## (wherein R 1 through R 7 independently represent hydrogen atom, halogen atom, alkyl group, aryl group, aralkyl group, sulfonate group, amino group, styryl group, nitro group, hydroxyl group, carboxyl group, cyano group, or aryl azo group; R 1 through R 7 may or may not be bonded to each other to form a substituted or an unsubstituted condensed ring; F 1 represents a divalent organic residue; and X 1 .sup.⊖ represents an anion) and the like with immunoglobulin and the like are formed. |