You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[4a,12c-dihydro-[1]benzothiolo[3,2-c]carbazol-5-yl(amino)methylidene]-12c-methyl-4aH-[1]benzothiolo[3,2-c]carbazole-5-carboximidamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C39H29N5S2
assistant