The molecule is a non-proteinogenic L-alpha-amino acid that is L-serine substituted at position 3 by a 2-iminoimidazolidin-4-yl group. It is a member of imidazolidines, a non-proteinogenic L-alpha-amino acid, a L-arginine derivative and a L-histidine derivative. It is a conjugate base of a (3S)-3-hydroxy-L-enduracididine(1+).
(2S,3R)-2-amino-3-[(4S)-2-amino-4,5-dihydro-1H-imidazol-4-yl]-3-hydroxypropanoic acid