... Phytochemistry. Volume 75, March 2012, Pages 67–77. ... of anomeric protons at δ H 4.99 (1H, d, J = 7.4 Hz) with the downfield shift signal of C-3 at δ C 89.8 suggested the linkage of a β-configuration d-glucuronic acid to C-3. The pattern of 13 C NMR data of GlcA-p (δ C 105.2 ( ...