![Protocatechuic acid, PCA molecule. It is 3,4-dihydroxybenzoic, phenolic acid, metabolite of antioxidant polyphenols, catechol, is found in green tea Stock Vector Image & Art - Alamy Protocatechuic acid, PCA molecule. It is 3,4-dihydroxybenzoic, phenolic acid, metabolite of antioxidant polyphenols, catechol, is found in green tea Stock Vector Image & Art - Alamy](https://c8.alamy.com/comp/2D8RN0T/protocatechuic-acid-pca-molecule-it-is-34-dihydroxybenzoic-phenolic-acid-metabolite-of-antioxidant-polyphenols-catechol-is-found-in-green-tea-2D8RN0T.jpg)
Protocatechuic acid, PCA molecule. It is 3,4-dihydroxybenzoic, phenolic acid, metabolite of antioxidant polyphenols, catechol, is found in green tea Stock Vector Image & Art - Alamy
![Chemical structure of protocatechuic acid, the product of quercetin... | Download Scientific Diagram Chemical structure of protocatechuic acid, the product of quercetin... | Download Scientific Diagram](https://www.researchgate.net/publication/221927260/figure/fig3/AS:305252805955590@1449789348995/Chemical-structure-of-protocatechuic-acid-the-product-of-quercetin-degradation-by.png)
Chemical structure of protocatechuic acid, the product of quercetin... | Download Scientific Diagram
![Protocatechuic acid exhibits hepatoprotective, vasculoprotective, antioxidant and insulin-like effects in dexamethasone-induced insulin-resistant rats - ScienceDirect Protocatechuic acid exhibits hepatoprotective, vasculoprotective, antioxidant and insulin-like effects in dexamethasone-induced insulin-resistant rats - ScienceDirect](https://ars.els-cdn.com/content/image/1-s2.0-S030090841930269X-fx1.jpg)
Protocatechuic acid exhibits hepatoprotective, vasculoprotective, antioxidant and insulin-like effects in dexamethasone-induced insulin-resistant rats - ScienceDirect
![Biomolecules | Free Full-Text | Protocatechuic Acid, a Simple Plant Secondary Metabolite, Induced Apoptosis by Promoting Oxidative Stress through HO-1 Downregulation and p21 Upregulation in Colon Cancer Cells Biomolecules | Free Full-Text | Protocatechuic Acid, a Simple Plant Secondary Metabolite, Induced Apoptosis by Promoting Oxidative Stress through HO-1 Downregulation and p21 Upregulation in Colon Cancer Cells](https://www.mdpi.com/biomolecules/biomolecules-11-01485/article_deploy/html/images/biomolecules-11-01485-g001.png)