You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name [(3aR,4R,6S,6aS,7S,9aS,9bR)-7-hydroxy-9-methyl-3-methylidene-2-oxospiro[4,5,6a,7,9a,9b-hexahydro-3aH-azuleno[4,5-b]furan-6,2'-oxirane]-4-yl] (E)-4-acetyloxy-2-methylbut-2-enoate into its molecular formula.
user
C22H26O8
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