82213-87-4

2,5-Pyrrolidinedione,1-[[1-[N-[1-[N-[1-[N-[1-[N-[(1,1-dimethylethoxy)carbonyl]-L-phenylalanyl]-L-prolyl]-L-phenylalanyl]-L-prolyl]-L-phenylalanyl]-L-prolyl]-L-phenylalanyl]-L-prolyl]oxy]-