preferred_name: a fatty acid + L-methionine => an N-(fatty acyl)-L-methionine + H2O
preferred_name_lc: a fatty acid + l-methionine => an n-(fatty acyl)-l-methionine + h2o
label: a fatty acid + L-methionine => an N-(fatty acyl)-L-methionine + H2O
label_lc: a fatty acid + l-methionine => an n-(fatty acyl)-l-methionine + h2o