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OHOH b.
HOO c.
CH2O
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OCH2OH
d.
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OHOOHOHOCH2
OHHO (2)
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HOCH2OHO(3)
HOCH2OOHOOHOHHOHOCH2HOOOHHOOHHO (4)
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OH-CH2OH
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OHOHCOOH
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a.
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d.
CH3OCH2OH