Fig. 1

UPLC-DAD-MS/MS chromatograms of PJH. a LC chromatogram (250 nm) and base peak chromatograms in (+)-ESI and (−)-ESI modes. b Extracted ion chromatograms of the identified phytochemicals in PJH. 1, allantoin; 2, gallic acid; 3, 5-hydroxymethyl-2-furaldehyde; 4, loganic acid; 5, oxypaeoniflorin; 6, 4-hydroxybenzoic acid; 7, morroniside; 8, caffeic acid; 9, fuziline; 10, paeonolide; 11, loganin; 12, apiopaeonoside; 13, sweroside; 14, paeonoside; 15, albiflorin; 16, paeoniflorin; 17, cornuside; 18, benzoylmesaconine; 19, coumarin; 20, benzoylpaeoniflorin; 21, paeonol; 22, alisol A; 23, pachymic acid