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 5-[[3-(2-chlorophenyl)-1,2,4-oxadiazol-5-yl]methyl]-2-thiophen-2-yl-1,2,3,3a-tetrahydropyrazolo[1,5-a]pyrazin-4-one is given. What is its corresponding molecular formula?
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C19H16ClN5O2S
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