21-O-Acetyl-21-O-de(3-carboxy-1-oxo-2-propenyl)-2-demethyl-2-methoxy-24-methylhygrolidin 7-acetate;7-O,21-O-Diacetyl-21-O-de(3-carboxy-1-oxo-2-propenyl)-2-demethyl-2-methoxy-24-methylhygrolidin
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