You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (4R,6S,8S,11E)-16-chloro-10,17,19-trihydroxy-4-methyl-3,7-dioxatricyclo[13.4.0.06,8]nonadeca-1(15),11,16,18-tetraene-2,13-dione is given. What is its corresponding molecular formula?
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C18H19ClO7
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