Supplier Page from Thermo Fisher Scientific for Copper discs, 9.0µ+0.127mm (0.354µ+0.005in) dia x 0.8µ+0.051mm (0.03µ+0.002in) thick, 99.9995% (metals basis)
Ethyl indole-2-carboxylate, 97% from Thermo Fisher Scientific
Ethyl trifluoroacetate, 99% from Thermo Fisher Scientific
Ethylene carbonate, 99+% from Thermo Fisher Scientific
Flavone, 99+% from Thermo Fisher Scientific