"7-[(3S)-3-Amino-1-oxo-4-(2,4,5-trifluorophenyl)butyl]-5,6,7,8-tetrahydro-3-(trifluoromethyl)-1,2,4-triazolo[4,3-a]pyrazine-d4 Phosphate; (S)-Sitagliptin-d4 Phosphate;",ent-Sitagliptin-d4 Phosphate,"Labelled ent-Sitagliptin Phosphate (S491025). ent-Sitagliptin Phosphate is the S-isomer of Sitagliptin Phosphate (S491000), as an impurity.", Stable Isotopes
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