You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2,6-bis[[2-(2-tert-butylphenyl)thieno[2,3-f][1]benzothiol-6-yl]methylidene]-s-indacene-1,3,5,7-tetrone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C54H38O4S4
assistant