You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5'-(4-chlorophenoxy)-5,6-dihydroxy-2'-methyl-8'-pyridazin-3-ylspiro[1,3-dioxepane-2,1'-4,5-dihydro-3H-2-benzazepine]-4,7-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H22ClN3O7
assistant