`H-UNDERSET(CH_(3)) underset(|)OVERSET (COOH) overset(|)C-OH``H-underset(CH_(3)) underset(|)overset (CH_(3)) overset(|)C-COOH``H-underset(CH_(3)) underset(|)overset (CHOOH) overset(|)C-COOH``H-underset(CH_(3)) underset(|)overset (H) overset(|)C-COOH`
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