You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
10-acetyl-4-(2-ethylbutoxy)-7-propan-2-yl-1,2,6,7-tetrahydro-[1]benzofuro[4,5-a]quinolizin-11-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H33NO4
assistant