Supplier Page from Thermo Fisher Scientific for Hydroxy Naphthol Blue, disodium salt, ACS reagent
4-Ethylresorcinol, 98% from Thermo Fisher Scientific
4-Fluorobenzenesulfonyl chloride, 98% from Thermo Fisher Scientific
9-Fluorenone, 99+% from Thermo Fisher Scientific
Ethyl 3-aminobenzoate, 99+% from Thermo Fisher Scientific