You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-amino-7-(1,1-difluoroethoxy)-2-[2-(hydroxymethyl)pentyl]-[1,2,4]triazolo[1,5-c]quinazolin-8-ol is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H21F2N5O3
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