Oxonantenine is an oxoaporphine alkaloid isolated from Annona glabra and has been shown to exhibit acetylcholinesterase inhibitory activity. It has a role as an EC 3.1.1.7 (acetylcholinesterase) inhibitor and a plant metabolite. It is an oxoaporphine alkaloid, an aromatic ether, an oxacycle, an organic heteropentacyclic compound and an alkaloid antibiotic. It is functionally related to an aporphine.