You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 7-[3-bromo-4-[(2,4-dichlorophenyl)methoxy]-5-ethoxyphenyl]-5-methyl-4,7-dihydrotetrazolo[1,5-a]pyrimidine-6-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
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C22H20BrCl2N5O4
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