You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named methyl 5-[[3-[(2S)-1-methoxypropan-2-yl]-4-oxoquinazolin-2-yl]sulfanylmethyl]-2-methylfuran-3-carboxylate by IUPAC nomenclature, provide its molecular formula.
user
C20H22N2O5S
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