4-(3-isothiocyanate-4-methoxyphenyl)-6,6''-bis(N,N-di-(carboxymethylaminomethyl))-2,2'-6',2''-terpyridine, tetrasodium salt
4-(3-isothiocyanate-4-methoxyphenyl)-6,6''-bis(n,n-di-(carboxymethylaminomethyl))-2,2'-6',2''-terpyridine, tetrasodium salt