11-Oxa-2,4,9-triazatridec-2-enoic acid,3-[[(1,1-dimethylethoxy)carbonyl]amino]-12,12-dimethyl-10-oxo-8-[[4-(4-oxo-4H-1-benzopyran-2-yl)phenoxy]carbonyl]-, 1,1-dimethylethyl ester,(8S)-
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