4. Identify the product of the following Diels-Alder reaction. (3%)
(A)
(B)
(C)
(D) 
(E)
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統計: 尚無統計資料
統計: 尚無統計資料
4. Identify the product of the following Diels-Alder reaction. (3%)
(A)
(B)
(C)
(D) 
(E)