You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-O-ethyl 2-O-methyl (6S,8aR)-6-[[(2R)-2-ethoxycarbonyl-4-oxopyrrolidin-1-yl]methyl]-3,4,4a,5,6,7,8,8a-octahydro-1H-isoquinoline-2,3-dicarboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H34N2O7
assistant