You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name tert-butyl N-[2-[[9-[2-[(2S,4R)-2-[(3-chloro-2-fluorophenyl)methylcarbamoyl]-4-fluoropyrrolidin-1-yl]-2-oxoethyl]purin-6-yl]amino]ethyl]carbamate into its molecular formula.
user
C26H31ClF2N8O4
assistant