You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (1S,2S,4S,5R,6R,7R)-6,7-bis(benzenesulfonyl)spiro[3-oxatricyclo[3.2.1.02,4]octane-8,1'-cyclopropane] ?
user
C21H20O5S2
assistant