You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(7-chloro-4H-thieno[3,2-c]thiochromen-2-yl)-[3-methyl-4-(4-methylphenyl)piperazin-1-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C24H23ClN2OS2
assistant