Supplier Page from Thermo Fisher Scientific for Sulfur trioxide-pyridine complex, 98%, active SO3 ca 48-50%
Adipic acid, 99% from Thermo Fisher Scientific
DL-Menthol, 99% from Thermo Fisher Scientific
Fumaric acid, 99+% from Thermo Fisher Scientific
trans-4-Hydroxy-L-proline, 99+% from Thermo Fisher Scientific