The molecule is cytidine in which the 2-keto group on the cytosine ring is substituted by an epsilon-Llysyl residue. It is a L-lysine derivative, a member of cytidines and a non-proteinogenic L-alpha-amino acid.
(2S)-2-amino-6-[[4-amino-1-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]pyrimidin-2-ylidene]amino]hexanoic acid