Which of the following anticholinesterase is derived from natural source
Refer kDT 6/e p 102 Physostigmine is a highly toxic parasympathomimetic alkaloid, specifically, a reversible cholinesterase inhibitor. It occurs naturally in the Calabar bean and the Manchineel tree. The chemical was synthesized for the first time in 1935 by Percy Lavon Julian and Josef Pikl.
Physostigmine
Pyridostigmine
Neostigmine
Tacrine
Autonomic nervous system