Not less than 95.0%
4-[(4-Aminohex-5-enoyl)amino]hex-5-enoic Acid; 4-[(4-Amino-1-oxo-5-hexenyl)amino]-5-hexenoic Acid; 4-[(4-Amino-1-oxo-5-hexen-1-yl)amino]-5-hexenoic Acid