6542 refers to scopolamine, 6542 is an alkaloid extracted from the plant scopolamine in April 1965, so the code name is 654, it is synthetic products referred to as 6542, 6542 is mainly as an acetylcholine antagonist, it can block the role of M choline receptors, the effect is similar to atropine, or slightly weaker than atropine, it has a relaxation of smooth muscle It has the effect of relaxing smooth muscle and relieving vasospasm. In addition, it can improve microcirculation and has analgesic effect, but its effect of inhibiting glandular secretion is relatively weak, in addition, this drug rarely causes central excitation symptoms. Sudden deafness and other related diseases.