下列eicosanoids 有血管收縮之作用,但是何者例外?
Thromboxane \mathrm{A}_{2}
\mathrm{A}_{2}
Prostaglandin \mathrm{I}_{2}
\mathrm{I}_{2}
Prostaglandin \mathrm{F}_{2}
\mathrm{F}_{2}
Leukotriene \mathrm{D}_{4}
\mathrm{D}_{4}