Supplier Page from Thermo Fisher Scientific for Polyethyleneimine, M.W. 60,000, 50% w/w aq. soln
3-Fluorobenzaldehyde, 98+% from Thermo Fisher Scientific
4-Fluorobenzenesulfonyl chloride, 98% from Thermo Fisher Scientific
Ethyl 3-hydroxybutyrate, 99% from Thermo Fisher Scientific
Ethyl phenylpropiolate, 98% from Thermo Fisher Scientific