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 5-(4-chlorobenzoyl)-4-(2-ethoxy-2-oxoethyl)-3-pyridin-1-ium-1-ylthiophene-2-thiolate .
user
C20H16ClNO3S2
assistant