You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2,12-dimethyl-21,22,23,24-tetraoxapentacyclo[16.2.1.13,6.18,11.113,16]tetracosa-1(20),3,5,8,10,13,15,18-octaene The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H20O4
assistant