1-Pyrrolidinecarboxylic acid,3-[[[3-(acetylamino)-3-methyl-1-oxobutyl]cyclopropylamino]methyl]-4-[[[4-methoxy-3-(3-methoxypropoxy)benzoyl](1-methylethyl)amino]methyl]-,1,1-dimethylethyl ester, (3R,4R)-
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