Supplier Page from Thermo Fisher Scientific for Niobium foil, 0.25mm (0.01in) thick, 99.97% (metals basis excluding Ta), Ta :<0.06%
Ethyl 2-mercaptoacetate, 99% from Thermo Fisher Scientific
Ethyl indole-2-carboxylate, 97% from Thermo Fisher Scientific
Ethyl L(-)-lactate, 97% from Thermo Fisher Scientific
Ethylbenzene, 99.8%, pure from Thermo Fisher Scientific