You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4-propan-2-ylphenyl)methyl 4-[(1H-pyrazole-5-carbonylamino)methyl]piperidine-1-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H28N4O3
assistant