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 3-(3,4-dichlorophenyl)-5-[2-(3-methoxy-3-methylazetidin-1-yl)-2-oxoethyl]thieno[3,2-c]pyridin-4-one .
user
C20H18Cl2N2O3S
assistant