2,5-Pyrrolidinedione,1-[[1-[N-[1-[N-[1-[N-[1-[N-[(1,1-dimethylethoxy)carbonyl]-L-leucyl]-L-prolyl]-L-leucyl]-L-prolyl]-L-leucyl]-L-prolyl]-L-leucyl]-L-prolyl]oxy]-
CAS No. 88740-65-2