You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2'R,3S,4'S,5'R)-6-chloro-4'-(3-chloro-2-fluorophenyl)-2'-(2,2-dimethylpropyl)-5-fluoro-5'-[2-(3-hydroxycyclobutyl)acetyl]spiro[1H-indole-3,3'-pyrrolidine]-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H30Cl2F2N2O3
assistant