You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule (4R)-1-[1-(cyclopropanecarbonyl)-2,3-dihydroindol-5-yl]-4-(4-methylpiperazine-1-carbonyl)pyrrolidin-2-one ?
user
C22H28N4O3
assistant