Figure 1.

Chemical structure of TTB2 and its inhibition of Rh1 cell growth. (A) TTB2 is pennogenin 3-O-α-L-rhamnopyranosyl-(1→2)[α-L-rhamnopyranosyl-(1→4)]-β-D-glucopyranoside (molecular weight, 884.48). (B) Cells were incubated with different concentrations of TTB2 for 12, 24 or 48 h separately. Inhibition of TTB2 on Rh1 cell growth was dose-dependent, which was determined by the trypan blue assay. Each value represents the mean ± standard deviation of three replicates. *P<0.05 vs. the control (untreated cells).