1,2-Pyrrolidinedicarboxylic acid,4-[4-[[2-[[4-[[4-[(aminoacetyl)amino]phenyl]azo]phenyl]amino]-2-oxoethyl]amino]-4-oxobutyl]-5-oxo-, 1-(1,1-dimethylethyl) 2-ethyl ester, (2S,4R)-
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