N(6),N(6)-dimethyl-L-lysyl(4)-[histone H3] + 2 A + 2 H2O <=> L-lysyl(4)-[histone H3] + 2 formaldehyde + 2 AH2
n(6),n(6)-dimethyl-l-lysyl(4)-[histone h3] + 2 a + 2 h2o <=> l-lysyl(4)-[histone h3] + 2 formaldehyde + 2 ah2