You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[(3S,5R)-6-(3-aminopropanoyl)-6-azabicyclo[3.2.2]nonan-3-yl]-2-cyclohept-3-en-1-yl-7-methyl-1,3-dihydroindole-2-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C28H40N4O2
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