You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4aS,12bR)-9-hydroxy-7a-methyl-3-(oxolan-2-ylmethyl)-4a-(3-phenylpropoxy)-1,2,4,5,6,13-hexahydro-4,12-methanobenzofuro[3,2-e]isoquinolin-7-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H37NO5
assistant