Supplier Page from Thermo Fisher Scientific for Copper foil, 0.675mm (0.027in) thick, annealed, 99.9% (metals basis)
Esculin hydrate, 97% from Thermo Fisher Scientific
Ethyl 4,4,4-trifluoroacetoacetate, 97% from Thermo Fisher Scientific
Ethyl isonipecotate, 98+% from Thermo Fisher Scientific
Ethyl trifluoroacetate, 99% from Thermo Fisher Scientific