You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-methylpropyl 4-[[7-[(2-methylphenyl)carbamoylamino]-2-oxoheptan-3-yl]carbamoylamino]-5-oxoheptanoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H42N4O6
assistant