The molecule is an alpha-amino-acid cation that is the conjugate acid of L-pyrrolysine, obtained by deprotonation of the alpha-amino group. It is a conjugate acid of a L-pyrrolysine.
[(1S)-1-carboxy-5-[[(2R,3R)-3-methyl-3,4-dihydro-2H-pyrrole-2-carbonyl]amino]pentyl]azanium