(S)-2-Amino-4-((aminoiminomethyl)amino)butanoic acid 14191-90-3 Butanoic acid, 2-amino-4-((aminoiminomethyl)amino)-, (S)- Butyric acid, 2-amino-4-guanidino-, L- L-2-Amino-4-guanidinobutyric acid L-Norarginine L-alpha-Amino-gamma-guanidinobutyric acid