You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1E)-1-[[1-[4-[3-[(E)-3,4-dihydro-2H-quinolizin-5-ium-1-ylidenemethyl]-2-methylindol-1-yl]butyl]-2-methylindol-3-yl]methylidene]-3,4-dihydro-2H-quinolizin-5-ium The above is the IUPAC name of a molecule. Write its molecular formula.
user
C42H44N4+2
assistant