You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3Z,5Z)-N-[(1E,3E,5Z)-2,3,7-trimethylocta-1,3,5,7-tetraenyl]hepta-3,5-dien-2-imine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H25N
assistant