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