Hydroxylysylpyridinoline

2-amino-6-[4-(2-amino-2-carboxy-ethyl)-5-(3-amino-3-carboxy-propyl)-3-hydroxy-pyridin-1-yl]-5-hydroxy-hexanoate

4-[(2S)-2-Amino-2-carboxyethyl]-1-[(2R,5S)-5-amino-5-carboxylato-2-hydroxypentyl]-3-[(3S)-3-amino-3-carboxypropyl]-5-hydroxypyridinium