Supplier Page from Thermo Fisher Scientific for Ethylene glycol-bis(beta-aminoethyl ether)-N,N,N',N'-tetraacetic acid tetrasodium salt, 95%
3-Fluorobenzaldehyde, 98+% from Thermo Fisher Scientific
4-Fluorobenzenesulfonyl chloride, 98% from Thermo Fisher Scientific
Ethyl 3-aminobenzoate, methanesulfonic acid salt, 98% from Thermo Fisher Scientific
Fluorescein isothiocyanate isomer I, 90%, pure from Thermo Fisher Scientific