Chlorogenic acid, luteoloside, pillyrin and forsythoside A were purchased from the National Institute for the Control of Pharmaceutical and Biological Products (Beijing, China). Neochlorogenic acid, cryptochlorogenic acid, 3,4-dicaffeoylquinic acid, 3,5-dicaffeoylquinic acid and forsythoside B (98% pure) were purchased from Sichuan Weikeqi Bio-tech Co., Ltd. (Sichuan, China). Isoforsythoside, caffeic acid, quinic acid, genistein, luteolin, quercetin, arctigenin, genistin, astragalin, hyperoside, pinoresinol-β-d-glucoside, arctiin, rutin, isoquercitrin, dipsacoside B, macranthoidin B and loganin (98% pure) were purchased from Chengdu Herbpurify Co., Ltd. (Sichuan, China). |