You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(Z)-1-N-[(1Z)-buta-1,3-dienyl]-4-[7'-[4-[(3E)-hexa-1,3,5-trien-3-yl]-6-phenyl-1,3,5-triazin-2-yl]spiro[fluorene-9,9'-xanthene]-2'-yl]-2-N-[3-(prop-2-enylideneamino)but-3-en-2-ylidene]but-2-ene-1,2-diimine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C55H44N6O
assistant