MeTyr-Gly-Gly-Phe-Leu-Arg-MeArg-D-Leu-NHEt;[N-methyl-Tyr1,N-methyl-Arg7-D-Leu8]dynorphin A (1-8)ethylamide;N-Methyltyrosyl-glycyl-glycyl-phenylalanyl-leucyl-arginyl-N-methyl-arginyl-leucyl ethylamide;(2R)-2-[[(2S)-5-(diaminomethylideneamino)-2-[[(2S)-5-(diaminomethylideneamino)-2-[[(2S)-2-[[(2S)-2-[[2-[[2-[[(2S)-3-(4-hydroxyphenyl)-2-(methylamino)propanoyl]amino]acetyl]amino]acetyl]amino]-3-phenylpropanoyl]amino]-4-methylpentanoyl]amino]pentanoyl]-methylamino]pentanoyl]amino]-N-ethyl-4-methylpentanamide
A large-scale synthesis of (MeTyr1, MeArg7, D-Leu8)dynorphin A-(1-8)-NHEt (E-2078) by application of the trifluoroacetic acid-pentamethylbenzene deprotecting procedure in the final stage.