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-(2-chlorophenyl)-2-[6-(4-methyl-2-pyridin-3-yl-1,3-thiazol-5-yl)pyridazin-3-yl]sulfanylacetamide .
user
C21H16ClN5OS2
assistant