You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3R)-3-[2-[(2S)-4-(4-fluorophenyl)-2-methylpiperazin-1-yl]ethyl]-2-methyl-8-(piperidine-1-carbonyl)-2,8-diazaspiro[4.5]decan-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H42FN5O2
assistant