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 (3'aR,5S,7'aR)-2',2'-dimethyl-3-(3-phenoxyphenyl)spiro[1,3-oxazolidine-5,6'-4,7a-dihydro-3aH-[1,3]dioxolo[4,5-c]pyran]-2,7'-dione .
user
C22H21NO7
assistant