Fig. 1. Structures of analytes released after tetramethylammonium hydroxide (TMAH)-induced thermochemolysis of lignin (P-type: R1 = H, R2 = H; G-type: R1 = OCH3, R2 = H, S-type: R1 = OCH3, R2 = OCH3); modified from del Rio et al. (1998).
