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