You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 2,3-dihydroindol-1-yl-[6-[(4-methylphenyl)methylamino]pyrimidin-4-yl]methanone is given. What is its corresponding molecular formula?
user
C21H20N4O
assistant