You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 1-(4-chlorophenyl)-2-[[6-(4-chlorophenyl)-[1,2,4]triazolo[4,3-b]pyridazin-3-yl]sulfanyl]ethanone .
user
C19H12Cl2N4OS
assistant