You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 1-[(5-chloro-1H-indol-2-yl)methyl]-8-(4-hydroxypiperidin-1-yl)-3,7-dimethylpurine-2,6-dione ?
user
C21H23ClN6O3
assistant