preferred_name: (2S)-2-aminobutanoate + formaldehyde => 2-ethyl-L-serine
preferred_name_lc: (2s)-2-aminobutanoate + formaldehyde => 2-ethyl-l-serine
label: (2S)-2-aminobutanoate + formaldehyde => 2-ethyl-L-serine
label_lc: (2s)-2-aminobutanoate + formaldehyde => 2-ethyl-l-serine