3. What term describes the structural relationship between (2R,3R,4S)-2,3,4-trichloroheptane and (2R,3R,4R)-2,3,4-trichloroheptane?
(A) not isomers
(B) constitutional isomers
(C) enantiomers
(D) diastereomers
(E) conformers

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統計： A(0), B(4), C(1), D(15), E(1) #1026888