You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 2-[1-[4-methyl-2-[(3S)-4-methyl-3-(2-methylpropyl)-2-oxopiperazin-1-yl]pentanoyl]piperidin-4-yl]acetamide ?
user
C22H40N4O3
assistant