Supplier Page from Thermo Fisher Scientific for Tetrabromophenolphthalein ethyl ester potassium salt
3-Fluorobenzyl bromide, 95% from Thermo Fisher Scientific
4-Fluorobenzenesulfonyl chloride, 98% from Thermo Fisher Scientific
Ethylbenzene, 99.8%, pure from Thermo Fisher Scientific
Fluorescein, pure from Thermo Fisher Scientific