Fig. 1

The typical HPLC chromatogram of Fukeqianjin formula. a Mixed standard reference substance. 1: chlorogenic acid (10.163 min); 2: ferulic acid (20.775 min); 3: lobetyolin (26.385 min); 4: andrographolide (31.671 min); 5: dehydrated andrographolide (44.164 min). b Fukeqianjin formula extract (0–50 min). c Fukeqianjin formula extract (8–25 min)