You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (2S,6R,17R)-17-(2-chloroacetyl)-2,6,15,15-tetramethyl-14,16-dioxapentacyclo[10.7.2.02,17.05,20.06,11]henicosa-4,10,12-trien-9-one into molecular formula.
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C25H31ClO4
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