You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5-bromo-2-methoxyphenyl)methyl-[[(3R)-2,5-dioxo-3-phenylpyrrolidin-1-yl]methyl]-methylazanium The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H22BrN2O3+
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