You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[[4-(9H-fluoren-9-ylmethoxycarbonylamino)-4-methylpentanoyl]amino]cyclopent-2-ene-1-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H30N2O5
assistant