You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 2-[[(1R)-1-(4-butylphenyl)-2-methylpropyl]amino]-N-(2-fluoro-5-methylsulfonylphenyl)acetamide ?
user
C23H31FN2O3S
assistant