You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [3-(cyclobutylmethyl)-4a,7-dihydroxy-1,2,4,5,6,7,7a,13-octahydro-4,12-methanobenzofuro[3,2-e]isoquinolin-9-yl] 2-methoxybut-2-enoate .
user
C26H33NO6
assistant