2-O-ethyl PAF C-16 is a synthetic PAF analog which contains an ethyl group, attached by an ether linkage, at the sn-2 position. It is a less potent agonist than methylcarbamyl PAF C-16 in the induction of platelet aggregation in both human and rabbit PRP. 2-O-ethyl PAF C-16 causes aggregation of neutrophils in the presence of divalent cations and a desensitization to aggregation in the absence of divalent cations.