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 (4S,5S)-7-(1-fluorocyclobutanecarbonyl)-4-(pyridin-3-yloxymethyl)-2,7-diazaspiro[4.4]nonan-1-one .
user
C18H22FN3O3
assistant