Which of the following anticholinesterase is derived from a natural source?
Ref: KD Tripathi pharmacology 7th edition (page.no: 108) Physostigmine is a Natural alkaloid from Physostigma venenosum (Calabar bean) and All others are synthetic Physostigmine is a highly toxic parasympathomimetic alkaloid, specifically, a reversible cholinesterase inhibitor
Physostigmine
Neostigmine
Pyridostigmine
Tacrine
Autonomic nervous system