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Pivalic acid [1,14-dioxo-11,11aalpha-dihydroxy-1,2,9,10,11,11a-hexahydro-8H-7,11-epoxy-9,10-(epoxymethanoxy)-3-oxa-7-aza-3H-cycloocta[de]naphthalen]-5-ylmethyl ester


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