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Protocatechuic acid (PCA) is a dihydroxybenzoic acid, a type of phenolic acid. It is a major metabolite of antioxidant polyphenols found in green tea. It has mixed effects on normal and cancer cells in in vitro and in vivo studies
P 2700 (OTTO) Protocatechuic acid, 98% Cas no 99-50-3 - used as intermediate of dyestuff and medicine.