Supplier Page from Thermo Fisher Scientific for Niobium foil, 1.0mm (0.04in) thick, annealed, 99.8% (metals basis)
1-Fluoro-4-nitrobenzene, 99% from Thermo Fisher Scientific
Ethyl butyrylacetate, 98% from Thermo Fisher Scientific
Ethyl indole-2-carboxylate, 97% from Thermo Fisher Scientific
Fluorescein, pure from Thermo Fisher Scientific