You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[5-[[1,3-bis[6-(octadeca-1,3,5,7,9,11,13,15,17-nonaynoxycarbonylamino)hexylamino]-1,3-dioxopropan-2-yl]amino]pentylamino] propanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C61H48N6O8
assistant