Identify the structure of the alkaloid having the following characteristics:
(A) It is a coca alkaloid having molecular formula \( \text{C}_9\text{H}_{11}\text{NO} \).
(B) As the free base, it rapidly racemizes.
(C) Its reactions show the presence of a keto group and a tertiary nitrogen atom.
(D) Synthesized by condensing \( \gamma \)-methylaminobutyraldehyde with ethylacetoacetate in buffered solution at pH 7.
Choose the correct answer from the options given below: