Robuta

https://www.mdpi.com/1420-3049/27/13/4200
2,5-Diketopiperazine derivatives, consisting of benzylidene and alkylidene substituents at 3 and 6 positions, have been considered as a core structure for...
diketopiperazinederivativespotentialantiinfluenza
https://www.jci.org/articles/view/112897/scanned-page/875
jciprolinediketopiperazinedkpimmunoreactivity