Figure 2 of
Suryanarayana, Mol Vis 2004;
Figure 2. Major hydrolysable tannoids of E. officinalis
Structures of the major tannoids of E. officinalis, emblicanin A (A), emblicanin B (B), punigluconin (C), and pedunculagin (D). While emblicanin A has one R1 and one R2 side groups, emblicanin B has two R2 side groups.