Supplier Page from Thermo Fisher Scientific for Niobium foil, 0.25mm (0.01in) thick, 99.97% (metals basis excluding Ta), Ta :<0.06%
Eicosanoic acid, 98% from Thermo Fisher Scientific
Ethyl 4,4,4-trifluoroacetoacetate, 97% from Thermo Fisher Scientific
Ethyl acetoacetate, 99%, pure from Thermo Fisher Scientific
Ethylenediamine, 99% from Thermo Fisher Scientific