Saxagliptin Impurity 11

Saxagliptin Impurity 31 Saxagliptin Impurity 24 Saxagliptin Impurity 4 (Deoxy Saxagliptin) Saxagliptin Impurity 33 Saxagliptin Impurity 25

axagliptin Impurity 28 Mesylate Saxagliptin Impurity 14 Tricyclo[3.3.1.13,7]decane-1-acetic acid, α-[[(1,1-diMethylethoxy)carbonyl]aMino]-3,5-dihydroxy-, (αS)- Saxagliptin Impurity 13 Saxagliptin Impurity 18

Saxagliptin IMpurity 2 Saxagliptin Impurity 10 Saxagliptin Impurity 17 Saxagliptin Impurity 12 Saxagliptin Impurity 15

Saxagliptin IMpurity 1 Saxagliptin Impurity 16 (1S,3S,5S)-2-(tert-Butoxycarbonyl)-2-azabicyclo[3.1.0]hexane-3-carboxylic acid