You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2S)-1-[(3R)-3-[2-[4-(4-fluorophenyl)piperazin-1-yl]ethyl]-1-oxo-2-oxa-8-azaspiro[4.5]decan-8-yl]-1-oxobutan-2-yl]carbamic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H35FN4O5
assistant