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 (3R,5'S)-5-chloro-3'-methyl-2,6'-dioxospiro[1H-indole-3,4'-5,7-dihydro-2H-pyrazolo[3,4-b]pyridine]-5'-carbonitrile ?
user
C15H10ClN5O2
assistant