Fig. 1
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs13020-022-00595-7/MediaObjects/13020_2022_595_Fig1_HTML.png)
Representative HPLC chromatograms of mixed standards and an extract of Angong Niuhuang Wan (AGNHW). A chromatographic profiles of nine mixed standards: Peak 1, Geniposide; Peak 2, Epiberberine; Peak 3, Coptisine; Peak 4, Baicalin; Peak 5, Palmatine; Peak 6, Berberine; Peak 7, Wogonoisde; Peak 8, Baicalein; Peak 9, Wogonin. B AGNHW extract HPLC profile. The peaks correspond to those found in mixed standards