A. H2NCH(CH3)COO−\mathrm{H}_{2} \mathrm{NCH}\left(\mathrm{CH}_{3}\right) \mathrm{COO}^{-}H2NCH(CH3)COO−
B. H3CH(CH3)COO−\mathrm{H}_{3} \overset{+}{\mathrm{N}} \mathrm{CH}\left(\mathrm{CH}_{3}\right) \mathrm{COO}^{-}H3N+CH(CH3)COO−
C. H3NH(CH3)COOH\mathrm{H}_{3} \overset{+}{\mathrm{N}} \mathrm{N} \mathrm{H}\left(\mathrm{CH}_{3}\right) \mathrm{COOH}H3N+NH(CH3)COOH
D. H2NCH(CH3)COOH\mathrm{H}_{2} \mathrm{NCH}\left(\mathrm{CH}_{3}\right) \mathrm{COOH}H2NCH(CH3)COOH
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