You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[1-[3-(4-chloro-2-methylphenyl)-4-oxoquinazolin-2-yl]ethyl]-N-methyl-3-(trifluoromethyl)benzamide by IUPAC nomenclature, provide its molecular formula.
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C26H21ClF3N3O2
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