Depolymerization of lignin. Catalyzes the C(alpha)-C(beta) cleavage of the propyl side chains of lignin. 1-(3,4-dimethoxyphenyl)-2-(2-methoxyphenoxy)propane-1,3-diol + H2O2 = 3,4-dimethoxybenzaldehyde + glycolaldehyde + guaiacol + H2O 2 (3,4-dimethoxyphenyl)methanol + H2O2 = 2 (3,4-dimethoxyphenyl)methanol radical + 2 H2O Secondary metabolite metabolism; lignin degradation. Belongs to the peroxidase family. Ligninase subfamily.