You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-oxo-8-(propan-2-ylamino)-N-(2-pyridin-2-ylethyl)-2H-[1,2,4]triazolo[4,3-a]pyrazine-6-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H19N7O2
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