1-O-Hexadecyl-2-O-acetyl-sn-glycero-3-phosphocholine, 74389-68-7, C26H54NO7P, Mr 523.69, 100mg. PAF (C16). Accelerated cognitive decline in Alzheimer’s patients is associated with accumulation of choline-containing phospholipids. One of them, C16-PAF, is specifically elevated in brains of Alzheimer’s patients. Enhanced exposure to this platelet-activating factor ultimately leads to neuronal death.