You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-2-(9H-fluoren-9-ylmethoxycarbonylamino)-2-[4-[(2-methylpropan-2-yl)oxy]phenyl]acetic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H27NO5
assistant