preferred_name: N(6)-methyl-L-lysyl(20)-[histone H4] + S-adenosyl-L-methionine = N(6),N(6)-dimethyl-L-lysyl(20)-[histone H4] + S-adenosyl-L-homocysteine + H(+)
preferred_name_lc: n(6)-methyl-l-lysyl(20)-[histone h4] + s-adenosyl-l-methionine = n(6),n(6)-dimethyl-l-lysyl(20)-[histone h4] + s-adenosyl-l-homocysteine + h(+)
label: "[histone H4]-N-methyl-L-lysine(20) N-methyltransferase"
label_lc: "[histone h4]-n-methyl-l-lysine(20) n-methyltransferase"