Definition: The principal cyclooxygenase metabolite of arachidonic acid. It is released upon activation of mast cells and is also synthesized by alveolar macrophages. Among its many biological actions, the most important are its bronchoconstrictor, platelet-activating-factor-inhibitory, and cytotoxic effects.
9-deoxy-delta-9-prostaglandin D2 [ 9-deoxy-delta-9-PGD2,PGJ2,prostaglandin J2 ] has potent antineoplastic & weak smooth muscle contracting activities; structure given in first source