You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (E)-2-[12-[[2-(cyclooctylamino)-2-oxoethyl]carbamoyl]-3-ethyl-8-methoxy-2,3,4,6,7,12b-hexahydro-1H-indolo[2,3-a]quinolizin-2-yl]-3-methoxyprop-2-enoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C34H48N4O6
assistant