You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6'-(3-bromo-N-octylanilino)-2'-(2-chloroanilino)-3'-methylspiro[2-benzofuran-3,9'-xanthene]-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C41H38BrClN2O3
assistant