You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3Z,5Z)-3,5-di(ethylidene)-2-[(3Z)-hexa-1,3,5-trien-3-yl]-1,4-dimethylnaphthalene;ethane is the IUPAC name of a molecule. Please give its molecular formula.
user
C30H48
assistant