You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-[(5-bromo-1-propanoyl-2,3-dihydroindol-7-yl)sulfonyl]-N-(pyridin-2-ylmethyl)piperidine-4-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C23H27BrN4O4S
assistant