Supplier Page from Thermo Fisher Scientific for 1-Boc-N-Fmoc-L-tryptophan, 97%
2-Ethoxyethyl ether, 98+%, extra pure from Thermo Fisher Scientific
4-Ethylphenol, 97% from Thermo Fisher Scientific
Ethyl 4,4,4-trifluoroacetoacetate, 97% from Thermo Fisher Scientific