12. a-D-葡萄卩比喃糖（ct-D-glucopyranose )與 P-d-葡萄耻喃糖(P-D-glucopyranose )’其關係爲 下列何項？
(A)對掌異構物(enantiomer)
(B)異位體(anomer )
(C)差向異構物(epimer )
(D)非對映異構物(diastereomer)

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統計： A(6), B(15), C(4), D(0), E(0) #919153