You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl 3-[5-(5-chloro-2-methylphenyl)pyrazol-1-yl]azetidine-1-carboxylate;ethane The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H28ClN3O2
assistant