Two new azaprostanoids, a hydrazone (3) and hydrazide (4), have been prepared by the condensation of 2-(6-carboxyhexy1) cyclopentanone with n-hexylhydrazine and caproic acid hydrazide. Preliminary results with the stable hydrazide 4 indicate that it inhibits arachidonic acid (AA) induced human platelet aggregation and that, unlike 13- azaprostanoic acid (l), ita site of action is at the cyclooxygenase level. Results with the ...