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 2-ethylsulfonyl-7-[4-(5-fluoropyridin-2-yl)-2-methoxy-6-methylphenyl]-2-azaspiro[3.5]nonane-6,8-dione .
user
C23H25FN2O5S
assistant