L-Phenylalanine, N-((1,1-dimethylethoxy)carbonyl)-L-tryptophyl-L-isoleucyl-L-alanyl-2-methylalanyl-L-isoleucyl-L-valyl-2-methylalanyl-L-leucyl-2-methylalanyl-L-prolyl-L-alanyl-2-methylalanyl-L-prolyl-2-methylalanyl-L-prolyl-, methyl ester