You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl (Z)-4-[5-[(E,4R,5S)-5-hydroxy-4-methylhex-2-enyl]-1,3-dioxan-2-yl]-3-methylbut-2-enoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H30O5
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