尼可刹米的结构式是

A、[img=~/QImg/Tiles/YA55_48_48_
A、gif]
B、[img=~/QImg/Tiles/YA55_48_48_
B、gif]
C、[img=~/QImg/Tiles/YA55_48_48_
C、gif]
D、[img=~/QImg/Tiles/YA55_48_48_
D、gif]
E、[img=~/QImg/Tiles/YA55_48_48_
E、gif]