Supplier Page from Thermo Fisher Scientific for Sulfur trioxide-pyridine complex, 98%, active SO3 ca 48-50%
4-Bromobutyric acid, 98% from Thermo Fisher Scientific
D-Mannitol, 98+% from Thermo Fisher Scientific
Epichlorohydrin, 99% from Thermo Fisher Scientific
trans-4-Hydroxy-L-proline, 99+% from Thermo Fisher Scientific