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)-4-[[3-(hydroxymethyl)phenyl]diazenyl]-2-[4-(4-methoxyphenyl)-1,3-thiazol-2-yl]-5-methyl-4H-pyrazol-3-one is given. What is its corresponding molecular formula?
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C21H19N5O3S
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