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Pivalic acid [6,11-dioxo-6abeta,6bbeta-dihydroxy-6,6a,6b,7,8,9-hexahydro-7alpha,8alpha-(epoxymethanoxy)-5H-4-oxa-9a-aza-9aH-cyclopent[a]acenaphthylen]-2-ylmethyl ester


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