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 1-[4-[3-(1,3-benzothiazol-2-yl)-6,8-dihydro-5H-[1,2,4]triazolo[4,3-a]pyrazin-7-yl]pyrimidin-2-yl]ethanol is given. What is its corresponding molecular formula?
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C18H17N7OS
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