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