Structures of Selected Eicosanoids

Prostaglandin E1. The 5-member ring is characteristic of the class.

Thromboxane A2. Oxygens have moved into the ring.

Leukotriene B4. Note the three conjugated double bonds.

Prostacyclin I2. The second ring distinguishes it from the prostaglandins.

Leukotriene E4, an example of a cysteinyl leukotriene.