You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[5-[5-[5,11-dibutyl-3-[5-[5-(2,2-diisocyanoethenyl)thiophen-2-yl]thiophen-2-yl]indolo[3,2-b]carbazol-9-yl]thiophen-2-yl]thiophen-2-yl]methylidene]propanedinitrile is the IUPAC name of a molecule. Please give its molecular formula.
user
C50H36N6S4
assistant