preferred_name: L-phenylalanine <=> (S)-3-amino-3-phenylpropanoate
preferred_name_lc: l-phenylalanine <=> (s)-3-amino-3-phenylpropanoate
label: L-phenylalanine <=> (S)-3-amino-3-phenylpropanoate
label_lc: l-phenylalanine <=> (s)-3-amino-3-phenylpropanoate