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 (4S,5S)-4-[[(2R)-2-benzyl-4-oxo-4-[3-[(3S)-3-phenylbutanoyl]phenyl]butyl]amino]-5-hydroxy-1-phenylhexan-3-one .
user
C39H43NO4
assistant