You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[2-[2-[2-[2-[2-(2-aminoethylamino)ethylamino]ethylamino]ethylamino]-1-[(2-methylpropan-2-yl)oxy]ethoxy]-4-hydroxy-3-(hydroxymethyl)-4-methylpentoxy]acetic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H51N5O7
assistant