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 (3S,3aR,4'R,6S,6aS)-3,6a-dihydroxy-4'-(4-methylphenyl)spiro[3,3a-dihydro-2H-furo[3,2-b]furan-6,5'-oxolane]-2',5-dione .
user
C16H16O7
assistant