Table II.

Four levels of the four active components in the orthogonal design.

	Glycyrrhizic acid (mg/kg)	Ferulic acid (mg/kg)	Peoniflorin (mg/kg)	Cinnamic acid (mg/kg)
Level	A	B	C	D
1	0	0	0	0
2	25	200	25	100
3	50	300	50	200
4	100	400	100	400