You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-O-benzyl 1-O-tert-butyl (2S,3R)-3-[[benzyl(phenylmethoxycarbonyl)amino]methyl]-2-(2-oxoethyl)butanedioate;ethane is the IUPAC name of a molecule. Please give its molecular formula.
user
C35H43NO7
assistant