Supplier Page from Thermo Fisher Scientific for O-(1H-Benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate, 98%
4-Fluorobenzenesulfonyl chloride, 98% from Thermo Fisher Scientific
Estrone, 99+% from Thermo Fisher Scientific
Ethyl 3-aminocrotonate, 98.5% from Thermo Fisher Scientific
Ethyl propiolate, 99% from Thermo Fisher Scientific