You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-[[2-[2-[[ethylamino(hydroxy)methyl]amino]-5-[2-(1-hydroxyethyl)pyrimidin-5-yl]-1,3-benzothiazol-7-yl]pyridin-4-yl]methyl]-3-methylazetidin-3-ol by IUPAC nomenclature, provide its molecular formula.
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C26H31N7O3S
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