You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[5-[2-(5-fluoropyridin-2-yl)acetyl]-6,7-dihydro-4H-triazolo[1,5-a]pyrazin-3-yl]methoxy]-N,N-dimethylacetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H21FN6O3
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