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 2-[3-[(1R)-1-[(2-chloro-6-morpholin-4-ylsulfonyl-7,8-dihydro-5H-pyrido[4,3-d]pyrimidin-4-yl)amino]ethyl]phenyl]-2,2-difluoroethanol is given. What is its corresponding molecular formula?
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C21H26ClF2N5O4S
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