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