You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1E,5Z,9E,12S)-1,5,9-trimethyl-12-(6-methylhepta-1,5-dien-2-yl)cyclotetradeca-1,5,9-triene is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H40
assistant