You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[3-[(7-amino-2,3-dihydro-1H-cyclopenta[b]indol-4-yl)methyl]pyridin-2-yl]isoindole-1,3-dione into its molecular formula.
user
C25H20N4O2
assistant