Figure 2

Chemical structures of active compounds. 1: 2,3,5,4′-tetrahydroxystilbene-2-O-β-D- glucopyranoside; 2: emodin; 3: physcion.
Chemical structures of active compounds. 1: 2,3,5,4′-tetrahydroxystilbene-2-O-β-D- glucopyranoside; 2: emodin; 3: physcion.