Figure 1.

Chemical structures of compounds 1–15. 1, isolariciresinol; 2, (+)-lariciresinol; 3, pinoresinol; 4, 4-hydroxybenzoic acid; 5, vanillic acid; 6, trans-p-coumaric acid; 7, catalposide; 8, specioside; 9, 6-O-trans-feruloyl catalpol; 10, minecoside; 11, 5,6-dihydroxy-7,4′-dimethoxyflavone-6-O-sophoroside; 12, 5,6-dihydroxy-7,4′-dimethoxyflavone-6-O-[6′′′-benzoyl-β-D-glucopyranosyl-(1→2)-β-D-glucopyranosyl-(1→2)]-β-D-glucopyranoside; 13, des-p-hydroxybenzoyl-3-deoxycatalpin; 14, (7R)-3-methoxy-(7-O-p-hydroxybenzoyl)eucommic acid; 15, (7R)-3-methoxy-hydroxyeucommic acid.