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Under IUPAC nomenclature, a molecule named 5-(2,5-dioxooxolan-3-yl)-7-methyl-3a,4,5,7a-tetrahydro-2-benzofuran-1,3-dione;4-methyl-3a,4,7,7a-tetrahydro-2-benzofuran-1,3-dione;3-methylideneoxolane-2,5-dione;10-methyl-4-oxatricyclo[5.2.1.02,6]dec-8-ene-3,5-dione;4-oxatricyclo[5.2.1.02,6]dec-8-ene-3,5-dione;1,7,8,9,10-pentachloro-4-oxatricyclo[5.2.1.02,6]dec-8-ene-3,5-dione is given. What is its corresponding molecular formula?
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C55H47Cl5O21
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