label: L-lysine + 2 S-adenosyl-L-methionine <=> N(6),N(6)-dimethyl-L-lysine + 2 S-adenosyl-L-homocysteine + 2 H(+)
label_lc: l-lysine + 2 s-adenosyl-l-methionine <=> n(6),n(6)-dimethyl-l-lysine + 2 s-adenosyl-l-homocysteine + 2 h(+)