You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3'-ethoxy-6'-hydroxy-2-[(E)-(3-hydroxyphenyl)methylideneamino]spiro[isoindole-3,9'-xanthene]-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C29H22N2O5
assistant