You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(E)-N-[3-[(4aS,8aR)-3,4,4a,5,6,7,8,8a-octahydro-1H-isoquinolin-2-yl]-3-oxopropyl]-2-(4-methylphenyl)ethenesulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H30N2O3S
assistant