Pro-toxic 1,2-dehydropyrrolizidine alkaloid esters, including unprecedented 10-membered macrocyclic diesters, in the medicinally-used Alafia cf. caudata and Amphineurion marginatum (Apocynaceae: Apocynoideae: Nerieae and Apocyneae) - Colegate, S M; Gardner, D R; Betz, J M; Fischer, O W; Liede-Schumann, S; Boppré, M (Phytochem Anal, 2016)