preferred_name: L-valine + L-arginine = N-amidino-L-valine + L-ornithine
preferred_name_lc: l-valine + l-arginine = n-amidino-l-valine + l-ornithine
label: L-valine + L-arginine = N-amidino-L-valine + L-ornithine
label_lc: l-valine + l-arginine = n-amidino-l-valine + l-ornithine