You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (3-fluorocyclobutyl)-[(8S)-8-[2-(pyridin-2-ylmethoxy)ethyl]-5-oxa-2-azaspiro[3.4]octan-2-yl]methanone into its molecular formula.
user
C19H25FN2O3
assistant