wilson dang
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The amino acid should have the hand drawn structure am I right? But I couldn't find this. Can soneone explain it? The ans is D ..

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Protoxylic
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The Ester group is found on the right hand side of the molecule, the methyl ester. The Carboxyl group is found on the lower left, the COOH group. The amino acid is a result of the carboxyl group and amine group being beta to each other; it is a beta amino acid. There isn't a lone carbonyl group as the carbonyls are contributing to a larger functional group, esters and carboxyl groups. The lone carbonyl group would be that of a ketone.
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username1445490
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All the C=O groups are part of larger groups: carboxyl, ester and amide groups.
The amino acid is not an alpha amino acid as you have drawn because the NH2 and COOH are not attached to the same carbon atom.
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