You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl 4-(3,4-dichlorophenyl)-4-[(2,5-dimethylpyrrol-1-yl)methyl]piperidine-1-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H30Cl2N2O2
assistant