preferred_name: D-threonine(in) + L-alanine(out) => D-threonine(out) + L-alanine(in)
preferred_name_lc: d-threonine(in) + l-alanine(out) => d-threonine(out) + l-alanine(in)
label: D-threonine(in) + L-alanine(out) => D-threonine(out) + L-alanine(in)
label_lc: d-threonine(in) + l-alanine(out) => d-threonine(out) + l-alanine(in)