PRODUCT NAME: Linagliptin Impurity 21
Date of Mfg: Sample COA	RETEST DATE: Sample COA

Catalogue Number	LIG-026
Lot Number	Sample COA
Batch Quantity	Sample COA
CAS Number	666816-91-7
Mol. Formula	C20H28N6O4
Molecular Wt	416.5 g/mol
Long Term Storage Condition	2°C to 8°C	Handling instruction	Sample COA
IUPAC	Tert-butyl (R)-(1-(7-(but-2-yn-1-yl)-3-methyl-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-8-yl)piperidin-3-yl)carbamate
Chemical Name	Linagliptin Impurity 21
Synonyms

Test	Results
Appearance	White To Off-White
Identification by 1H NMR	Sample COA
Identification By IR	Sample COA
Mass (ESI)	Sample COA
Purity	NLT 98%
Wt. Loss by TGA	Sample COA
% Potency	Sample COA
Solubility	Soluble In DMSO
QC Release Date	Sample COA
Attachments	Sample COA
Note: This material can be used as a referance standard and is for research purpose ONLY and not for human consumption