1-O,2-O:3-O,4-O-Dimethylene-β-D-galactopyranose
1-O,2-O:3-O,4-O-Dimethylene-β-D-galactopyranose ??
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1-O,2-O:3-O,4-O-Dimethylene-β-D-galactopyranose ?? ?? ? ???
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1-O,2-O:3-O,4-O-Dimethylene-β-D-galactopyranose ?? ??
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