You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-[methyl-[2-oxo-2-(2,4,6-trimethylanilino)ethyl]amino]-2-oxoethyl]cyclobutane-1-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H26N2O4
assistant