You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(7-bromo-5-nitro-2,1,3-benzothiadiazol-4-yl)sulfanyl]-3H-quinazolin-4-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C14H6BrN5O3S2
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