You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(3-oxo-2-prop-2-enyl-2-azabicyclo[2.2.2]octan-1-yl)-(4-propylsulfanylphenyl)methyl]carbamic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H28N2O3S
assistant