DEOXYPYRIDINOLINE 1-[(5S)-5-Amino-5-carboxylatopentyl]-3-[(3S)-3-amino-3-carboxypropyl]-4-[(2S)-2-amino-2-carboxyethyl]-5-hydroxypyridinium 4-[(2S)-2-Amino-2-carboxyethyl]-1-[(5S)-5-amino-5-carboxylatopentyl]-3-[(3S)-3-amino-3-carboxypropyl]-5-hydroxypyridinium D-Pyr (+)-Deoxypyridinoline. TFA salt Dpd. TFA salt 4-[(2S)-2-Amino-2-carboxyethyl]-1-[(5S)-5-amino-5-carboxypentyl]-3-[(3S)-3-amino-3-carboxypropyl]-5-hydroxypyridinium Inner Salt Lysylpyridinoline