You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(E)-3-(1,3-benzodioxol-5-yl)-1-[1-(2-ethoxyphenyl)-4a-hydroxy-1,3,4,5,6,7,8,8a-octahydroisoquinolin-2-yl]prop-2-en-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H31NO5
assistant