You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2Z,5Z,8E)-9-ethyl-8-methyl-4-methylidene-N-(methylideneamino)dodeca-2,5,8-trien-3-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H28N2
assistant