You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-bromo-N-[2-[(4-fluorophenyl)methyl-[2-(1H-indol-3-yl)ethyl]amino]-2-oxoethyl]-N-(3-methoxypropyl)benzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C30H31BrFN3O3
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