You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-ethyl-10-methyl-2-oxo-N-phenyl-9-thia-1-azatricyclo[6.3.1.04,12]dodeca-4,6,8(12)-triene-5-sulfonamide by IUPAC nomenclature, provide its molecular formula.
user
C19H20N2O3S2
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