Write the structural formulas of all isomeric aminobutanoic acids.

CH3-CH2-CH (NH2) -COOH alpha-aminobutyric acid (2-aminobutanoic acid),
CH3-CH (NH2) -CH2-COOH beta-aminobutyric acid (3-aminobutanoic acid),
H2N-CH2-CH2-CH2-COOH gamma-aminobutyric acid (4-aminobutanoic acid).



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