You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N,N-diethyl-4-(4-oxo-5,6,7,8-tetrahydro-3H-quinazolin-2-yl)piperazine-1-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C17H27N5O2
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