You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[2-[2-[2-[2-[3-[(2-methylpropan-2-yl)oxy]-3-oxopropoxy]ethoxy]ethoxy]ethoxy]ethoxy]acetic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H32O9
assistant