You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[2-[5-[3,3-dimethyl-1-[2-(N-methylanilino)-2-oxoethyl]indol-1-ium-2-yl]penta-2,4-dienylidene]-3,3-dimethylindol-1-yl]-N-methyl-N-phenylacetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C43H45N4O2+
assistant