You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 6-(2,4-dimethyl-3-oxo-1,4-benzoxazin-6-yl)-3-ethyl-5-methylimidazo[2,1-b][1,3]thiazole-2-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
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C19H19N3O4S
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