You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 5-fluoro-2-[[(5R)-9-(pyridine-4-carbonyl)-1,9-diazaspiro[4.6]undecan-1-yl]methyl]benzonitrile into molecular formula.
user
C23H25FN4O
assistant