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Representative chromatogram of measured phenolic acids. 1. gallic acid; 2. protocatechuic acid; 3. chlorogenic acid; 4. salicylic acid; 5. p-hydroxycbenzoic acid; 6. vanillic acid; 7. caffeic acid; 8. syringic acid; 9. benzoic acid; 10. p-coumaric acid; 11. ferulic acid; 12. cinnamic acid.
