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John R. Lewis. Amaryllidaceae, muscarine, imidazole, oxazole, thiazole and peptide alkaloids, and other miscellaneous alkaloids. Nat. Prod. Rep. 2000, 17 (1): 57–84. PMID 10714899. doi:10.1039/a809403i.
Dimitris C. Gournelif; Gregory G. Laskarisb; Robert Verpoorte. Cyclopeptide alkaloids. Nat. Prod. Rep. 1997, 14 (1): 75–82. PMID 9121730. doi:10.1039/NP9971400075.