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Non-amino acid-derived alkaloids, as well as true and proto alkaloids. Reproduced with permission from Casciaro, B.; Mangiardi, L.; Cappiello, F.; Romeo, I.; Loffredo, M. R.; Iazzetti, A.; Calcaterra, A.; Goggiamani, A.; Ghirga, F.; Mangoni, M. L.; Botta, B.; Quaglio, D., Molecules; published by MDPI, 2020 [20].
