Supplier Page from Thermo Fisher Scientific for Magnesium sulfate heptahydrate, 98+%, ACS reagent
4-Fluorobenzenesulfonyl chloride, 98% from Thermo Fisher Scientific
Ethyl oxalyl chloride, 98% from Thermo Fisher Scientific
Fluorescein isothiocyanate isomer I, 90%, pure from Thermo Fisher Scientific
Fluorescein, pure from Thermo Fisher Scientific