You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (6R)-3-ethenyl-3-ethyl-1,4-dimethyl-N-methylsulfonyl-6,7-dihydro-5H-pyrrolo[1,2-c]pyrimidine-6-carboxamide by IUPAC nomenclature, provide its molecular formula.
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C15H23N3O3S
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