氯霉素的化学结构式为

A、[img=~/QImg/Tiles/YA63_297_1_
A、gif]
B、[img=~/QImg/Tiles/YA63_297_1_
B、gif]
C、[img=~/QImg/Tiles/YA63_297_1_
C、gif]
D、[img=~/QImg/Tiles/YA63_297_1_
D、gif]
E、[img=~/QImg/Tiles/YA63_297_1_
E、gif]