You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 4-chloro-N-[2-(2-methylpropylamino)-2-(2-methylpyrimidin-5-yl)ethyl]-1H-indole-5-carboxamide is given. What is its corresponding molecular formula?
user
C20H24ClN5O
assistant