You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(3-amino-6,8-dihydro-5H-[1,2,4]triazolo[4,3-a]pyrazin-7-yl)-1-[2-chloro-3-(trifluoromethyl)phenyl]ethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C14H13ClF3N5O
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