You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-(2,6-dimethylphenyl)-4-[2-[1-(2-methylphenyl)ethylamino]-2-oxoethyl]sulfanylbutanamide by IUPAC nomenclature, provide its molecular formula.
user
C23H30N2O2S
assistant