You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1S,5R,8aR,8bR)-5-carbamoyloxy-2-oxo-1-[(1R)-1-prop-2-enoxycarbonyloxyethyl]-5,6,7,8,8a,8b-hexahydro-1H-azeto[1,2-b]isoindole-4-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
user
C18H22N2O8
assistant