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What is the molecular formula of the molecule identified by (5S,10R)-5-[(S)-furan-3-yl(hydroxy)methyl]-5,7,11,11-tetramethyl-8,15-dioxospiro[12,16-dioxatetracyclo[8.7.0.01,13.02,7]heptadecane-6,3'-oxirane]-2'-carboxylic acid ?
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C26H32O9
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