You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[[(1R,5R)-1-bicyclo[3.1.0]hexanyl]amino]-4-(9H-fluoren-9-ylmethoxycarbonylamino)-5-oxopentanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H28N2O5
assistant