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Keywords: Ethyl protocatechuate OR 3943-89-3 OR 4YGJ96WTBG OR Ethyl 3,4-dihydroxybenzoate OR Protocatechuic acid ethyl ester OR 3,4-Dihydroxybenzoic acid ethyl ester OR Benzoic acid, 3,4-dihydroxy-, ethyl ester OR Benzoic acid, 3,4-dihydroxy-, ethyl ester (9CI)
