72. What product would you obtain from Claisen condensation of ethyl propanoate?
(A) Ethyl 2-ethyl-3-oxopentanoate
(B) Propyl 2-methyl-3-oxopentanoate
(C) Ethyl 2-methyl-3-oxohexanoate
(D) Propyl 2-methyl-3-oxohexanoate
(E) Ethyl 2-methyl-3-oxopentanoate

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統計： A(0), B(1), C(2), D(1), E(2) #1074618