Supplier Page from Thermo Fisher Scientific for 2,4-Dinitrobenzenesulfonic acid sodium salt, 97%
4-Ethylresorcinol, 98% from Thermo Fisher Scientific
Ethoxymethylenemalononitrile, 98% from Thermo Fisher Scientific
Ethyl cyanoformate, 99% from Thermo Fisher Scientific
Fluorescein, pure from Thermo Fisher Scientific