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(1R,2S,6S,7S,9R,12R,13S)-9-[(4R)-2,2-Dimethyl-1,3-dioxolan-4-yl]-7,9,13,17,17-pentamethyl-3,5,8-trioxatetracyclo[11.4.0.02,6.07,12]heptadecan-4-one


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