[CH3:1][N:2]([CH2:20][CH2:21][CH2:22][CH3:23])[C:3](=[O:19])[CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][NH:11]C(OC(C)(C)C)=O.[ClH:24]>O1CCOCC1>[ClH:24].[CH3:1][N:2]([CH2:20][CH2:21][CH2:22][CH3:23])[C:3](=[O:19])[CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][NH2:11]Combine 8-(t-butoxycarbonyl)amino-octanoic acid methyl-butyl-amide and 4M hydrochloric acid in dioxane (10 mL). After 1 hour, the reaction mixture is evaporated in vacuo to give a residue. Triturate the residue with diethyl ether to give a solid. Collect the solid by filtration and dry in vacuo to give the title compound.
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