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. 2020 Apr 16;9(4):514. doi: 10.3390/plants9040514

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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TIC chromatogram of the standards mixture (1 μg/mL) analyzed by the LC-MS/MS. Legend: (1) quinic acid, (2) malic acid, (3) fumaric acid, (4) gallic acid, (5) protocatechic acid, (6) pyrocatechol, (7) chlorogenic acid, (8) 4-OH-benzoic acid, (9) vanillic acid, (10) caffeic acid, (11) syringic acid, (12) vanillin, (13) salicylic acid, (14) p-coumaric acid, (15) rutin, (16) ferulic acid, (17) sinapic acid, (18) hesperidin, (19) isoquercitrin, (20) rosmarinic acid, (21) nicotiflorin, (22) α-coumaric acid, (23) rhoifolin, (24) quercitrin, (25) apigetrin, (26) coumarin, (27) myricetin, (28) fisetin, (29) cinnamic acid, (30) liquiritigenin, (31) quercetin, (32) luteolin, (33) naringenin, (34) apigenin, (35) hesperetin, (36) kaempferol and (37) chrysin.