| protocatechuic | <chemistry> Pertaining to, derived from, or designating, an organic acid which is obtained as a white crystalline substance from catechin, asafetida, oil of cloves, etc, and by distillation itself yields pyrocatechin. Source: Websters Dictionary (01 Mar 1998) |
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| protocatechuic acid | 3,4-Dihydroxybenzoic acid; 4-carboxycatechol;oxidation product of epinephrine. (05 Mar 2000) |