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(3'R,4S,6'R,11'S,12'R,23'Z)-23'-[(E)-2-Chlorobut-2-enylidene]-11',12'-dimethyl-22'-methylidene-13',13'-dioxospiro[1,3-dioxolane-4,7'-20-oxa-13lambda6-thia-1,14-diazatetracyclo[14.11.2.03,6.019,28]nonacosa-16(29),17,19(28)-triene]-2,15'-dione


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