preferred_name: an alpha-amino acid ester + H2O => an alpha-amino acid + an alcohol + H(+)
preferred_name_lc: an alpha-amino acid ester + h2o => an alpha-amino acid + an alcohol + h(+)
label: an alpha-amino acid ester + H2O => an alpha-amino acid + an alcohol + H(+)
label_lc: an alpha-amino acid ester + h2o => an alpha-amino acid + an alcohol + h(+)