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Certificate of Analysis

Befotertinib mesylate

Molecular Formula:	C₂₉H₃₂F₃N₇O₂.CH₄O₃S
Molecular Weight:	663.71
CAS No.:	2226167-02-6
Storage (From the date of receipt):	3 years -20°C powder
	1 year -80°C in solvent
Image:

HPLC: 99.81% purity | NMR: Consistent with structure