Supplier Page from Thermo Fisher Scientific for Potassium tert-butoxide, 97%
Ethyl acetoacetate, 99%, pure from Thermo Fisher Scientific
Methyl 4-(chloroformyl)butyrate, 98% from Thermo Fisher Scientific
Methyl chloroformate, 99% from Thermo Fisher Scientific
Semicarbazide hydrochloride, 99+% from Thermo Fisher Scientific