You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S,5R)-7-[3-[(2-fluorophenyl)methyl]azetidine-3-carbonyl]-3-oxa-7,9-diazabicyclo[3.3.2]decan-10-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H22FN3O3
assistant