You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1S,2S,6S,7S,8R)-8-ethenyl-7-(hydroxymethyl)-4-oxatricyclo[5.3.0.02,6]decan-8-ol by IUPAC nomenclature, provide its molecular formula.
user
C12H18O3
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