Supplier Page from Thermo Fisher Scientific for Selenium shot, amorphous, 1-6mm (0.04-0.24in), Puratronic, 99.999+% (metals basis)
4-Fluorobenzenesulfonyl chloride, 98% from Thermo Fisher Scientific
Ethyl cyanoformate, 99% from Thermo Fisher Scientific
Ethyl isonipecotate, 98+% from Thermo Fisher Scientific
Ethyl phenylpropiolate, 98% from Thermo Fisher Scientific