You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance N-(3-chloro-2-methylphenyl)-3-[2-(1H-indol-3-yl)ethyl]-4-methyl-1,3-thiazol-2-imine .
user
C21H20ClN3S
assistant