You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance N-[(1R)-1-[[(Z)-2-aminobut-1-enyl]sulfanylamino]-2-(4-nitrophenyl)ethyl]-4-oxo-4-phenylbutanamide .
user
C22H26N4O4S
assistant