You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as (4-chlorophenyl)-[4-[[1-(4-methylsulfonylphenyl)tetrazol-5-yl]methyl]piperazin-1-yl]methanone using the IUPAC nomenclature.
user
C20H21ClN6O3S
assistant