You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (2-oxo-3a,4,5,6,7,7a-hexahydro-1,3-benzodioxol-5-yl)methyl 2-oxo-3a,4,5,6,7,7a-hexahydro-1,3-benzodioxole-5-carboxylate .
user
C16H20O8
assistant