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Structures of pyrrolizidine alkaloids (PAs) with acetylcholinesterase inhibitory activity and miscellaneous activity discussed in this review. Except seneciphylline and pochonicine, the other PAs represent the acetylcholinesterase inhibitors in this figure. Heliotrine, integerrimine, retrorsine, senecionine and usaramine also had anti-ulcer effects and were listed in Figure 1.
