You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 4,9,14,19-tetraoxapentacyclo[15.3.0.02,6.07,11.012,16]icosa-1(20),2,5,7,10,12,15,17-octaene ?
user
C48H24O12
assistant