Supplier Page from Thermo Fisher Scientific for 2,3-Dimethoxybenzoic acid, 99%
Esculin hydrate, 97% from Thermo Fisher Scientific
Ethylenediaminetetraacetic acid, tetrasodium salt hydrate, 98%, pure from Thermo Fisher Scientific
Fumaric acid, 99+% from Thermo Fisher Scientific
Gluconic acid, 50 wt% solution in water from Thermo Fisher Scientific