preferred_name: 2 an L-alpha-amino acid => an L-aminoacyl-L-amino acid + H2O
preferred_name_lc: 2 an l-alpha-amino acid => an l-aminoacyl-l-amino acid + h2o
label: 2 an L-alpha-amino acid => an L-aminoacyl-L-amino acid + H2O
label_lc: 2 an l-alpha-amino acid => an l-aminoacyl-l-amino acid + h2o