You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-(2-aminoethyl)-2-(3,5-dimethylphenyl)-1H-indol-5-yl]-2-methyl-1-pyrrolidin-1-ylpropan-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H33N3O
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