You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4R,4aS,6E,7aR,12bS)-3-(cyclopropylmethyl)-4a,9-dihydroxy-6-[(4-iodophenyl)methylidene]-1,2,4,5,7a,13-hexahydro-4,12-methanobenzofuro[3,2-e]isoquinolin-7-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H26INO4
assistant