You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[1-(1-benzyl-5-methoxy-6-oxopyrimidin-2-yl)propyl-[(4-bromophenyl)methyl]amino]-N,N-dimethylethanamine oxide is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H33BrN4O3
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