You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R,4R)-1-[3-(9H-fluoren-9-ylmethoxycarbonylamino)-2-methylbutanoyl]-4-hydroxypyrrolidine-2-carboxylic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H28N2O6
assistant