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 methyl (2R)-2-[[2-[(2S,5S)-5-benzyl-3,6-dioxopiperazin-2-yl]acetyl]amino]pent-4-enoate .
user
C19H23N3O5
assistant