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 (2R)-2-[4-[[5-(4-chlorophenyl)thiophen-2-yl]methyl]piperazin-1-yl]propanamide using the IUPAC nomenclature.
user
C18H22ClN3OS
assistant