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 1-(4-acetylphenyl)-3-[3-[2-(3,4-dichlorophenyl)-2-oxoethyl]sulfanylphenyl]thiourea .
user
C23H18Cl2N2O2S2
assistant