You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule ethyl 4-[2-[(5,5-dioxo-2-phenyl-4,6-dihydrothieno[3,4-c]pyrazol-3-yl)amino]-2-oxoacetyl]piperazine-1-carboxylate into molecular formula.
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C20H23N5O6S
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