has role independent continuant beta-adrenergic antagonist vasodilator agent antihypertensive agent 2-acetyl-1-alkyl-sn-glycero-3-phosphocholine 2-O-acetyl-1-O-hexadecyl-sn-glycero-3-phosphocholine A 2-acetyl-1-alkyl-<em>sn</em>-glycero-3-phosphocholine betaine which has hexadecyl as the alkyl group. PAF is a potent phospholipid activator and mediator of many leukocyte functions, including platelet aggregation, inflammation, and anaphylaxis. CHEBI:44811 bronchoconstrictor agent hematologic agent