You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2Z,6Z,9Z)-3-[(E)-3-methylbut-1-enyl]-2-[(Z)-prop-1-enyl]-1-oxacycloundeca-2,6,9-trien-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H24O2
assistant