Exploring the Molecular Mechanism of the Antioxidant Activity of Medicine and Food Homology Licorice Flavonoids Based on Pharmacophore Theory and Quantum Calculations

Figure 9

HOMO and LUMO orbital distributions of licochalcone B (a), retrochalcone (b), isoliquiritin (c), and isoliquiritigenin (d).

(a)

(b)

(c)

(d)