You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4R)-1',2-bis(pyridin-2-ylmethyl)spiro[3H-5,1lambda6,2-benzoxathiazepine-4,3'-pyrrolidine] 1,1-dioxide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H24N4O3S
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