The molecule is a D-lysine derivative in which D-lysine is substituted on N(6) by a (2-amino-4-oxo-3,4-dihydropteridin-6-yl)methyl group. It is a D-lysine derivative and a D-alpha-amino acid. It derives from a 2-aminopteridin-4(3H)-one.
(2R)-2-amino-6-[(2-amino-4-oxo-3H-pteridin-6-yl)methylamino]hexanoic acid