You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [(2S,5S,6S,9S,10R)-5-methyl-16-sulfanylidene-18-oxa-15-azapentacyclo[11.8.0.02,10.05,9.014,19]henicosa-1(13),14(19),20-trien-6-yl] acetate by IUPAC nomenclature, provide its molecular formula.
user
C22H27NO3S
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