You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (1S,2S,5S)-3-[(2S,3S,4S)-2,4-bis(ethenyl)-3-hydroxycyclopentyl]-2,5-bis(ethenyl)cyclopentan-1-ol into molecular formula.
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C18H26O2
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