CH CH OH oh H 3 H HO H OH CH3 CH 2,3-丁二醇的三种立体异构体( Fischer投影式) CH 3 CH 3 CH3 2 2 H oh HO H OH 3 HO H oh OH CH CH CH2, 3-丁二醇的三种立体异构体（ Fischer 投影式） 2 CH3 HO H H OH CH3 III 3 CH3 H OH CH3 H OH 2 3 CH3 HO H CH3 H OH 2 3 II CH3 H OH CH3 HO H 2 3 I III CH3 H OH CH3 H OH 2 3