`-O^(-)gt-Ohgt-OCOCH_(3)gt-COCH_(3)``-Ohgt-O^(-)gt-OCOCH_(3)gt-COCH_(3)``-Ohgt-O^(-)gt-COCH_(3)gt-OCOCH_(3)``-O^(-)gt-COCH_(3)gt-OCOCH_(3)gt-OH`
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