preferred_name: an L-alpha-amino acid(out) + L-kynurenine(in) => an L-alpha-amino acid(in) + L-kynurenine(out)
preferred_name_lc: an l-alpha-amino acid(out) + l-kynurenine(in) => an l-alpha-amino acid(in) + l-kynurenine(out)
label: an L-alpha-amino acid(out) + L-kynurenine(in) => an L-alpha-amino acid(in) + L-kynurenine(out)
label_lc: an l-alpha-amino acid(out) + l-kynurenine(in) => an l-alpha-amino acid(in) + l-kynurenine(out)