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 1-[4-[(2S)-3-[4-(3-chlorophenyl)piperazin-1-yl]-2-hydroxypropoxy]phenyl]ethanone using the IUPAC nomenclature.
user
C21H25ClN2O3
assistant