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(2S,3R,4S,5R,6R,8R,9S,10S,11R,12R,13R)-3-(3,4-Dimethoxybenzyloxy)-12-<(1,1-dimethylethyl)dimethylsilyloxy>-1-<(1,1-dimethylethyl)diphenylsilyloxy>-13-(4-methoxybenzyloxy)-2,4,8,10,12-pentamethyl-9,11-(2,4,6-trimethylbenzylidenedioxy)pentadecane-5,6-diol