You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [(3S,4R)-6-chloro-4-[4-(hydroxymethyl)-2-oxopyridin-1-yl]-2,2-dimethyl-3,4-dihydrochromen-3-yl] methanesulfonate by IUPAC nomenclature, provide its molecular formula.
user
C18H20ClNO6S
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