You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(E)-N-[(4S,4aS,7S,7aR,12bR)-3-(cyclopropylmethyl)-4a,9-dihydroxy-7a-methyl-2,4,5,6,7,13-hexahydro-1H-4,12-methanobenzofuro[3,2-e]isoquinolin-7-yl]-3-(furan-3-yl)prop-2-enamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H32N2O5
assistant