You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 1-(4,4-dimethyl-1-sulfanylidenedithiolo[3,4-c]quinolin-5-yl)-3-phenylpropan-1-one using the IUPAC nomenclature.
user
C21H19NOS3
assistant