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Methyl 4-[[(16R,20R)-13,21,21-trimethyl-2,18-dioxo-17,19,22-trioxa-13-azahexacyclo[12.11.0.03,12.05,10.015,23.016,20]pentacosa-1(25),3,5,7,9,11,14,23-octaen-24-yl]amino]butanoate


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