You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 5-[7-[(3S)-3-methyl-1-methylsulfonylpyrrolidin-3-yl]-2-[(3S)-3-methylmorpholin-4-yl]-5,6-dihydropyrrolo[2,3-d]pyrimidin-4-yl]pyrimidin-2-amine by IUPAC nomenclature, provide its molecular formula.
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C21H30N8O3S
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