You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3,5-dimethyl-N-[2-[(2-methylphenyl)methylsulfanyl]ethyl]-1,2-oxazole-4-sulfonamide by IUPAC nomenclature, provide its molecular formula.
user
C15H20N2O3S2
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