You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
10-(1,3-benzodioxol-5-yl)-1,2,3,4-tetrahydro-[1]benzofuro[6,5-c]isochromen-5-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H16O5
assistant