You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2S,3S)-N-(4-amino-1-cyclobutyl-3,4-dioxobutan-2-yl)-1-[(2S)-2-(tert-butylcarbamoylamino)-2-cyclohexylacetyl]-3-(dichloromethyl)pyrrolidine-2-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C27H43Cl2N5O5
assistant