Supplier Page from Thermo Fisher Scientific for p-Toluenesulfonyl isocyanate, 96%
2-Mercapto-1-methylimidazole, 98% from Thermo Fisher Scientific
4-Bromobutyric acid, 98% from Thermo Fisher Scientific
L(+)-Histidine methyl ester dihydrochloride, 97% from Thermo Fisher Scientific
Melatonine, 99% from Thermo Fisher Scientific