You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[1,5-bis(4-chlorophenyl)penta-1,4-dien-3-ylideneamino]-5,7-diazaspiro[2.5]oct-6-en-6-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H22Cl2N4
assistant