You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2S)-N-(4-chlorophenyl)-1-(1-propylbenzotriazol-5-yl)sulfonylpiperidine-2-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C21H24ClN5O3S
assistant