A group of compounds, which are structurally similar to alkaloids.
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There are three types of alkaloids: true alkaloids, protoalkaloids, and pseudoalkaloids. True alkaloids have a heterocyclic ring with nitrogen, while, in the protoalkaloids, the N atom derived from amino acids is not part of heterocyclic ring.
Caption: Figure 1: Main alkaloids groups: True Alkaloids (a), Protolakaloids (b) and Pseudoalkaloids (c), precursors, and skeleton structures.