13. How many stereoisomers for a pentose?
(A) 2
(B) 4
(C) 6
(D) 8
(E) 16.
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統計: A(0), B(0), C(0), D(2), E(0) #3191423
統計: A(0), B(0), C(0), D(2), E(0) #3191423