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 (3R,7aS)-N-(2-cyclopropyl-1,3-benzoxazol-5-yl)-7a-methyl-5-oxo-2,3,6,7-tetrahydropyrrolo[2,1-b][1,3]thiazole-3-carboxamide is given. What is its corresponding molecular formula?
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C18H19N3O3S
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