You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl (1R)-2-ethenyl-1-[[(2S,4S)-4-hydroxy-1-[(2R)-2-[(2-methylpropan-2-yl)oxycarbonylamino]non-8-enoyl]pyrrolidine-2-carbonyl]amino]cyclopropane-1-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H43N3O7
assistant