. "Ethyl protocatechuate" . "3,4-Dihydroxybenzoic acid ethyl ester" . . . "Ethyl-3,4-dihydroxybenzoate" . . "Ethyl ester of 3,4-dihydroxybenzoic acid" . . . . . "EDHB" . . . . "Ethyl protocatechuate" . . "Ethyl 3,4-dihydroxybenzoate" . . . . . .