L-Aspartic acid,N-[O-(1,1-dimethylethyl)-N-[O-(1,1-dimethylethyl)-N-[N-[O-(1,1-dimethylethyl)-L-threonyl]-L-phenylalanyl]-L-threonyl]-L-seryl]-, 4-(1,1-dimethylethyl)ester
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