(R)-4-Oxo-4-[3-(trifluoromethyl)-5,6-dihydro[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl]-1-(2,4,5-trifluorophenyl)butan-2-amine ; CAS # 486460-32-6 (Base) ; 486459-71-6 (HCl) ;

4-Desfluoro 2-Fluoro Sitagliptin ; (R)-3-Amino-1-(3-(trifluoromethyl)-5,6-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl)-4-(2,3,6-trifluorophenyl)butan-1-one ;

2-Desfluoro Sitagliptin ; (R)-4-Oxo-4-[3-(trifluoromethyl)-5,6-dihydro[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl]-1-(4,5-difluorophenyl)butan-2-amine ; CAS # 486459-88-5 ;

(E)-2,2,2-Trifluoro-N-(piperazin-2-ylidene)acetohydrazide ; CAS # 849832-73-1 ;

(R)-4-Oxo-4-[3-(trifluoromethyl)-5,6-dihydro[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl]-1-phenylbutan-2-amine ;

(R)-3-Amino-N-((R)-4-oxo-4-(3-(trifluoromethyl)-5,6-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl)-1-(2,4,5-trifluorophenyl)butan-2-yl)-4-(2,4,5-trifluorophenyl)butanamide ; CAS # 2072867-07-1 ;

(2Z)-4-Oxo-4-[3-(trifluoromethyl)-5,6-dihydro[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl]-1-(2,4,5-trifluorophenyl)but-2-en-2-amine ; CAS # 767340-03-4 ;

Sitagliptin (S)-Isomer Phosphate Salt ; CAS # 823817-58-9 ;

4-Desfluoro Sitagliptin ; CAS # 486460-31-5 (base) ; 1345822-87-8 (phosphate salt) ;

5-Desfluoro Sitagliptin ; CAS # 945261-48-3 (Base) ; 1345822-86-7 (Phosphate) ;

Sitagliptin Fumarate Adduct Impurity ; 2-((R)-4-Oxo-4-(3-(trifluoromethyl)-5,6-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl)-1-(2,4,5-trifluorophenyl)butan-2-ylamino)succinic acid ; CAS # 2088771-60-0 ;

Sitagliptin Triazecine Analog ; (R)-10-(2,4,5-Trifluorobenzyl)-3-(trifluoromethyl)-6,7,10,11-tetrahydro [1,2,4] triazolo [3,4-c][1,4,7]triazecine-8,12(5H,9H)-dione ; CAS # 2088771-61-1 ;

Sitagliptin Styrylacetyl Analog (USP) ; Sitagliptin 3-En Analog ; 3-Desamino-3,4-Dehydro Sitagliptin ; CAS # 1675201-14-5 ; 1803026-58-5 ;

Sitagliptin Phenylcrotonyl Analog (USP) ; Sitagliptin 2-En Analog ; 3-Desamino-2,3-Dehydro Sitagliptin ; CAS# 1253056-18-6 ;

Sitagliptin Acid (HCl) ; (3R)-3-Amino-4-(2,4,5-trifluorophenyl)butanoic acid HCl ; CAS # 936630-57-8 (Base) ; 1204818-19-8 (HCl) ;

3-Hydroxy-1-(3-(trifluoromethyl)-5,6-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl)-4-(2,4,5-trifluorophenyl)butan-1-one ; CAS # 1253056-01-7 ;

2-(2,4,5-Trifluorophenyl)acetic acid ; CAS # 209995-38-0 ;

Methyl 3-oxo-4-(2,4,5-trifluorophenyl)butanoate ; CAS # 769195-26-8 ;

2,2-Dimethyl-5-(2-(2,4,5-trifluorophenyl)acetyl)-1,3-dioxane-4,6-dione ; CAS # 1152439-73-0 ;

Methyl 3-amino-4-(2,4,5-trifluorophenyl)butanoate ; CAS # 1253055-92-3 ;

(S)-2-((R)-4-Oxo-4-(3-(trifluoromethyl)-5,6-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl)-1-(2,4,5-trifluorophenyl)butan-2-ylamino)-2-phenylacetamide ; CAS # 769195-20-2 ;

Sitagliptin Acid Methyl Ester HCl ; Sitagliptin STA Impurity H (HCl) ; (R)-Methyl 3-amino-4-(2,4,5-trifluorophenyl)butanoate HCl ; CAS # 881995-69-3 (Base) ; 1374985-05-3 (HCl) ;

4-(2,4,5-Trifluorobenzyl)-1-(benzyloxy)azetidin-2-one ; CAS # 767352-30-7 ;

(R)-tert-Butyl 1-(2,5-difluorophenyl)-4-oxo-4-(3-(trifluoromethyl)-5,6-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl)butan-2-ylcarbamate ; CAS # 486460-22-4 ;

tert-Butyl (R)-(4-diazo-1-(2,5-difluorophenyl)-3-oxobutan-2-yl)carbamate ; CAS # 837430-12-3 ;

(2Z)-4-Oxo-4-[3-(trifluoroMethyl)-5,6-dihydro-[1,2,4] triazolo[4,3-a]pyrazine-7(8H)-yl]-1-(2,4,5-trifluorophenyl)butan-2-one ; CAS # 764667-65-4 ;

10-(2,4,5-Trifluorobenzyl)-3-(trifluoromethyl)-9,10-dihydro-5H-[1,2,4]triazolo[3',4':3,4]pyrazino[1,2-a]pyrimidin-8(6H)-one ;

7-[(3R)-3-[(N-Acetyl)amino]-1-oxo-4-(2,4,5-trifluorophenyl)butyl]-5,6,7,8-tetrahydro-3-(trifluoromethyl)-1,2,4-triazolo[4,3-a]pyrazine ; CAS # 1379666-94-0 ;

(R)-tert-Butyl 4-oxo-4-(3-(trifluoromethyl)-5,6-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl)-1-(2,4,5-trifluorophenyl)butan-2-ylcarbamate ; CAS # 486460-23-5 ;

(R)-3-(tert-Butoxycarbonyl)-4-(2,4,5-trifluorophenyl)butanoic acid ; CAS # 486460-00-8 ;

(R)-(4-Oxo-4-(3-(trifluoromethyl)-5,6-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl)-1-(2,4,5-trifluorophenyl)butan-2-yl)carbamic acid ;

(R)-N-(4-Oxo-4-(3-(trifluoromethyl)-5,6-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl)-1-(2,4,5-trifluorophenyl)butan-2-yl)formamide ;

(R)-3-(((S)-2-Hydroxy-1-phenylethyl)amino)-1-(3-(trifluoromethyl)-5,6-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl)-4-(2,4,5-trifluorophenyl)butan-1-one ; CAS # 1459759-18-2 ;

Sodium (R)-4-oxo-4-(3-(trifluoromethyl)-5,6-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl)-1-(2,4,5-trifluorophenyl)butan-2-ylsulfamate ; CAS # 940002-57-3 (acid) ;

(R)-7-(3-Amino-4-(2,4,5-trifluorophenyl)butanoyl)-3-(trifluoromethyl)-6,7-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-8(5H)-one ;

(R)-4-Oxo-4-[3-(trifluoromethyl)-5,6-dihydro[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl]-1-(2,4,5-trifluorophenyl)butan-2-amine phosphate hydrate ; CAS # 654671-77-9 ;

STA Impurity-G ; 3-(Trifluoromethyl)-6,7-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-8(5H)-one ; CAS # 877402-45-4 ;

4-Oxo-4-[3-(trifluoromethyl)-5,6-dihydro[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl]-1-(2,4,5-trifluorophenyl)butan-2-amine acetate ; CAS # 823817-56-7 (Base) ; 2137530-88-0 (Acetate) ; 823817-57-8 (Phosphate) ;

3-(Trifluoromethyl)-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyrazine hydrochloride ; CAS # 762240-92-6 ;

7-Nitroso-3-(trifluoromethyl)-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyrazine ; CAS # 2892260-32-9 ;