preferred_name: 2-hydroxy-2-methylpropanoate + L-lysyl-[protein] => N(6)-(2-hydroxyisobutanoyl)-L-lysyl-[protein] + H2O
preferred_name_lc: 2-hydroxy-2-methylpropanoate + l-lysyl-[protein] => n(6)-(2-hydroxyisobutanoyl)-l-lysyl-[protein] + h2o
label: 2-hydroxy-2-methylpropanoate + L-lysyl-[protein] => N(6)-(2-hydroxyisobutanoyl)-L-lysyl-[protein] + H2O
label_lc: 2-hydroxy-2-methylpropanoate + l-lysyl-[protein] => n(6)-(2-hydroxyisobutanoyl)-l-lysyl-[protein] + h2o