You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5Z)-5-[(5Z)-5-cyclohexa-2,4-dien-1-ylidenehexan-2-ylidene]cyclohexa-1,3-diene The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H22
assistant