You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N'-[5-bromo-2-[(2,6-dimethylphenyl)carbamoyl]indol-1-yl]-N-(2,2-diphenylethyl)oxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C33H29BrN4O3
assistant