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(13R,14S,18S,19S,23S)-9-Hydroxy-16,16-dimethyl-5,7,15,17,20,22-hexaoxa-12-azahexacyclo[11.10.0.02,10.04,8.014,18.019,23]tricosa-2,4(8),9-triene-11,21-dione


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