Supplier Page from Thermo Fisher Scientific for Cobalt(II) sulfate heptahydrate, Puratronic:r, 99.999% (metals basis)
4-Ethylresorcinol, 98% from Thermo Fisher Scientific
Ethyl phenylcyanoacetate, 97% from Thermo Fisher Scientific
Ethyl propiolate, 99% from Thermo Fisher Scientific