5-tert-Butyl 1-(2,5-dioxopyrrolidin-1-yl) N-[(benzyloxy)carbonyl]-L-glutamate;5-O-tert-Butyl 1-O-(2,5-dioxopyrrolidin-1-yl) (2S)-2-(phenylmethoxycarbonylamino)pentanedioate;
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