preferred_name: a carboxylate + L-lysine => an N(6)-acyl-L-lysine + H2O
preferred_name_lc: a carboxylate + l-lysine => an n(6)-acyl-l-lysine + h2o
label: a carboxylate + L-lysine => an N(6)-acyl-L-lysine + H2O
label_lc: a carboxylate + l-lysine => an n(6)-acyl-l-lysine + h2o