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