You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[[3-(cyclohexylmethyl)-2-(cyclopropylmethylsulfonyl)imidazol-4-yl]methyl]-4-ethylpiperazine into its molecular formula.
user
C21H36N4O2S
assistant