You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 4-[[3-(3-hydroxy-3-methyl-2-oxo-3a,4-dihydroindol-1-yl)phenyl]methyl]-2H-phthalazin-1-one .
user
C24H21N3O3
assistant