label: 2-ammonio-6-((2-((4-ammonio-5-oxido-5--oxopentyl)amino)-4-methyl-4,5-dihydro-1H-imidazol-5-ylidene)amino)hexanoate
label_lc: 2-ammonio-6-((2-((4-ammonio-5-oxido-5--oxopentyl)amino)-4-methyl-4,5-dihydro-1h-imidazol-5-ylidene)amino)hexanoate