Supplier Page from Thermo Fisher Scientific for 4-(4-Anilinophenylazo)benzenesulfonic acid sodium salt, indicator grade
3-Fluorobenzoic acid, 99% from Thermo Fisher Scientific
4-Ethylaniline, 99+% from Thermo Fisher Scientific
Ethoxymethylenemalononitrile, 98% from Thermo Fisher Scientific
Ethyl indole-2-carboxylate, 97% from Thermo Fisher Scientific