Supplier Page from Thermo Fisher Scientific for Hydrogen bromide, pure, 33 wt% solution in glacial acetic acid
Ethyl 3-aminobenzoate, 99+% from Thermo Fisher Scientific
Ethyl 4-bromocrotonate, 75%, tech from Thermo Fisher Scientific
Ethyl acetoacetate, 99%, pure from Thermo Fisher Scientific
Ethyl cyanoacetate, 98+% from Thermo Fisher Scientific