sulfonium compound, is a positively charged sulfur atom carrying three alkyl groups as substituents

Adrenaline and noradrenaline are found in the adrenal gland and in neurons of the peripheral (autonomic) and central nervous systems. maintain internal body state (‘homeostasis’) but, in the brain, they are thought also to influence arousal and mood.

noradrenaline regulates alertness and the sleep-wakefulness cycle