Supplier Page from Thermo Fisher Scientific for Polyethyleneimine, M.W. 60,000, 50% w/w aq. soln
Epichlorohydrin, 99% from Thermo Fisher Scientific
Ethyl isonipecotate, 98+% from Thermo Fisher Scientific
Fluorescein, pure from Thermo Fisher Scientific
meso-Erythritol, 99% from Thermo Fisher Scientific