You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1Z,3E)-1-N-buta-1,3-dien-2-yl-4-(3-methylbutan-2-yl)hexa-1,3-diene-1,5-diamine by IUPAC nomenclature, provide its molecular formula.
user
C15H26N2
assistant