You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[3-[1-[(3-ethylsulfanyl-1,2,4-thiadiazol-5-yl)amino]-1-oxopropan-2-yl]sulfanylphenyl]-3,3-dimethylbutanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H26N4O2S3
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