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 1-[[(2S,5S)-7-(2-fluoropyridine-4-carbonyl)-1,10-dioxa-7-azaspiro[4.6]undecan-2-yl]methyl]pyridin-2-one .
user
C20H22FN3O4
assistant