You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(4,5-dimethyl-1H-imidazol-2-yl)-1-(1-ethylpyrazol-4-yl)sulfonylpiperidine is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H23N5O2S
assistant