You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[[4-(dimethylamino)-2-(9H-fluoren-9-ylmethoxycarbonylamino)butanoyl]-propan-2-ylamino]propanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H35N3O5
assistant