You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named disodium;2-[7-[(7-amino-6-oxoheptyl)-ethylamino]-2-oxochromen-3-yl]-3H-thiophen-3-ide-5-sulfonate;sulfur trioxide by IUPAC nomenclature, provide its molecular formula.
user
C22H24N2Na2O9S3
assistant