Supplier Page from Thermo Fisher Scientific for Bis[3-(triethoxysilyl)propyl]tetrasulfide, S 22.3% (typical)
4-Bromobutyric acid, 98% from Thermo Fisher Scientific
5-Aminolevulinic acid hydrochloride, 98+% from Thermo Fisher Scientific
Iron(III) acetylacetonate, 99+% from Thermo Fisher Scientific
Oxytetracycline dihydrate, 95% from Thermo Fisher Scientific