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 (1R)-1-phenyl-N-(1,2,5-thiadiazol-3-yl)-3,4-dihydro-1H-isoquinoline-2-carboxamide is given. What is its corresponding molecular formula?
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C18H16N4OS
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