You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[(4-aminoquinazolin-7-yl)methyl]-4-[(6-bromo-1-benzothiophen-2-yl)methyl]piperazin-2-one into its molecular formula.
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C22H20BrN5OS
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