3,4-Dihydroxybenzoic Acid Ethyl Ester 3,4-Dihydroxybenzolic Acid (CAS No.: 99-50-3) is is a natural phenolic compound found in many edible and medicinal plants, that is why it has a common name as Protocatechuic Acid. It may exist as ester form naturally. It is not easy to obtain by traditional chemical synthesis, even sometimes it is not … Continue reading 3,4-Dihydroxybenzoic Acid Ethyl Ester