You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(2Z)-2-[[11-[(Z)-[(1E)-1-[cyano(isocyano)methylidene]-3-oxoinden-2-ylidene]methyl]-3,3,10,10-tetramethyl-7,14-dithiatetracyclo[6.6.0.02,6.09,13]tetradeca-1(8),2(6),4,9(13),11-pentaen-4-yl]methylidene]-3-oxoinden-1-ylidene]-2-isocyanoacetonitrile is the IUPAC name of a molecule. Please give its molecular formula.
user
C42H24N4O2S2
assistant