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CERTIFICATE OF ANALYSIS Reference Substance Date Dipyridamole Impurity -C Batch No. IUPAC Name: 2,2'-[[6-chloro-4,8-di(piperidin-1-yl)pyrimido[5,4-d]pyrimidine-2yl]nitrilo]diethanol

Molecular Formula: C20H30ClN7O2 Molecular weight: 435.95 g/mol Sr.# 1

Test Appearance

Results Yellow colour solid

Data ref. ------

2 3 4

Purity by HPLC NMR MASS

99.62% Conform Conform

Chromatogram attached Report attached Report attached

Storage condition: Store at 2-8째C, protect from direct sunlight. Shipment date: This certificate of analysis is valid for two years from date of manufacturing, provided the substance is stored under suitable conditions. Manufacturing date: Retest date: Document data reference:

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Dipyridamole impurity c