You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-[methyl-[[3-(trifluoromethyl)phenyl]methyl]amino]-2-oxoethyl]cyclobutane-1-carboxylic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H18F3NO3
assistant