You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3R)-3-(2-methyl-1H-indol-3-yl)-2-(3-oxo-3-piperidin-1-ylpropyl)-3H-isoindol-1-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H27N3O2
assistant