You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-[2-methyl-3-[2-(3-methylbut-2-en-2-yl)-4-[1-[1-(4-nitrophenyl)ethylamino]ethenyl]phenyl]butyl]phenyl]benzoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C39H42N2O4
assistant