Supplier Page from Thermo Fisher Scientific for Fluorescein isothiocyanate isomer I, 90%, pure
3-Fluorobenzoic acid, 99% from Thermo Fisher Scientific
4-Fluorobenzenesulfonyl chloride, 98% from Thermo Fisher Scientific
Ethyl chloroacetate, 99% from Thermo Fisher Scientific
Ethyl chloroformate, 99% from Thermo Fisher Scientific