physostigmine alkaloid molecule. skeletal formula. chemical structure

physostigmine alkaloid molecule formula chemical alzheimer antidote atomic atoms bean calabar chemistry cholinesterase composition compound drawing emptying esere eserine flat gastric glaucoma hippomane icon inhibitor intoxication lab laboratory line manchineel manchioneel mancinella medical medicine molecular ordeal physostigma physostigmin poison research science skeletal structure tree venenosum