You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-ethyl-N-(1'-methylspiro[3,4-dihydrochromene-2,4'-piperidine]-4-yl)-2,4-dioxo-1H-quinazoline-7-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H28N4O4
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