You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-[4-(2-carboxyphenyl)-6-chloro-2-ethoxynaphthalen-1-yl]-7-chloro-3-ethoxynaphthalen-1-yl]benzoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C38H28Cl2O6
assistant