148182-34-7 Boc-flflf Boc-phe(D)-leu-phe(D)-leu-phe-OH L-Phenylalanine, N-(N-(N-(N-(N-((1,1-dimethylethoxy)carbonyl)-D-phenylalanyl)-L-leucyl)-D-phenylalanyl)-L-leucyl)- tert-Butyloxycarbonyl-phenylalanyl-leucyl-phenylalanyl-leucyl-phenylalanyl-OH