physostigmine, eserine, c15h21n3o2 molecule. it is cholinesterase inhibitor, toxic parasympathomimetic indole alkaloid. structural

alkaloid anticholinesterase antidote atom atomic bean c15h21n3o2 calabar carbon chemical chemistry chlorine cholinesterase drawing flat fluorine formula gastric glaucoma hippomane hydrogen icon illustration indole inhibitor manchineel mancinella molecular molecule nitrogen organic oxygen parasympathomimetic physostigma physostigmine structural structure sulfur vector venenosum