Figure 1

The traditional Chinese medicine system of evaluating fingerprint similarity was used to create a representative Ultra-Performance Liquid Chromatography chromatogram of Pudilan at 289 nm (A) and the reference chromatogram (B). The six main peaks were represented by the peaks numbered 1–6 in the chromatogram. The peaks denoted by the numbers 1, 2, 3, 4, 5 and 6 were, respectively, epigoitrin, chlorogenic acid, caffeic acid, baicalin, acetylcorynoline and baicalein.