1-tert-butyl-3,3,5,5-tetraethylpiperazin-2-one

4-[1-(4-bromophenyl)-ethoxy]-1-tert-butyl-3,3,5,5-tetraethylpiperazin-2-one

4-(1-((4-(tert-butyl)-2,2,6,6-tetraethyl-3-oxopiperazin-1-yl)oxy)ethyl)benzoic acid

Boc-Lys(4-[1-{1-tert-butyl-3,3,5,5-tetraethylpiperazin-2-on-1-yloxy}ethyl]benzoyl)-Gly-OMe