Supplier Page from Thermo Fisher Scientific for Sulfur trioxide-pyridine complex, 98%, active SO3 ca 48-50%
D-Mannitol, 98+% from Thermo Fisher Scientific
Itaconic acid, 99+% from Thermo Fisher Scientific
L(+)-Histidine methyl ester dihydrochloride, 97% from Thermo Fisher Scientific
Methyl 4-(chloroformyl)butyrate, 98% from Thermo Fisher Scientific