Supplier Page from Thermo Fisher Scientific for Buffer solution pH 4, Phthalate buffer, traceable to NIST, ready to use
2-Ethylhexanoic acid, 99% from Thermo Fisher Scientific
4-Fluorobenzyl chloride, 98% from Thermo Fisher Scientific
Esculin hydrate, 97% from Thermo Fisher Scientific
Ethyl trifluoroacetate, 99% from Thermo Fisher Scientific