hydrolyzable tannins of T. nilotica. Among these tannins, the anomeric position, unless esterified with a galloyl unit, is always esterified by the galloyl part bearing two hydrogens of the DHDG or the isoDHDG moiety, while C-2 esterification of glucose was always by the galloyl part bearing an isolated hydrogen of the DHDG or the isoDHDG moiety. The upfield shift of H-1 (δH 5.50) of the glucose core in 1 relative to that (δH 6.02) of the glucose cores in 2 and 3 could be attributable
to the anisotropic effect of the DHDG moiety at C-2 of the glucose core (Figure 1)