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 3-(2,4-dimethoxyphenyl)-5-[(6-phenylpyridazin-3-yl)sulfanylmethyl]-1,2,4-oxadiazole is given. What is its corresponding molecular formula?
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C21H18N4O3S
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