You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 4-[5-(4-ethylphenyl)sulfonyl-1-(2-methoxyethyl)-6,7-dihydro-4H-pyrazolo[4,3-c]pyridin-3-yl]-1,3-oxazole by IUPAC nomenclature, provide its molecular formula.
user
C20H24N4O4S
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