You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(4-bromophenyl)-4-hydroxy-3-(4-methoxyphenyl)-1-(2H-tetrazol-5-yl)-2H-pyrrol-5-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H14BrN5O3
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