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