You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2,4-dichloro-N-[2-methoxy-5-[3-(2-methoxyethoxy)-4-oxopyrido[1,2-a]pyrimidin-7-yl]pyridin-3-yl]-5-methylbenzenesulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C24H22Cl2N4O6S
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