You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule benzyl N-[1-(9H-fluoren-9-ylmethoxycarbonylamino)-6-[6-[(2-methylpropan-2-yl)oxycarbonylamino]hexanoylamino]-1-oxohexan-2-yl]carbamate .
user
C40H50N4O8
assistant