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