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(2S,4As,6aR,6aS,6bR,9S,10S,12aS,14bR)-10-(2-acetamidoacetyl)oxy-2,4a,6a,6b,9,12a-hexamethyl-9-[(5-methyl-2-oxo-1,3-dioxolan-4-yl)methoxycarbonyl]-13-oxo-3,4,5,6,6a,7,8,8a,10,11,12,14b-dodecahydro-1H-picene-2-carboxylic acid


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